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Recent questions in Mathematics
Questions
>>
JEEMAIN and NEET
>>
Mathematics
Mathematics
Limit, Continuity and Differentiability
Class11
Trigonometry
Class12
Sets, Relations and Functions
If
α
,
β
,
γ
are real numbers then,
|
1
cos
(
β
−
α
)
cos
(
γ
−
α
)
cos
(
α
−
β
)
1
cos
(
γ
−
β
)
cos
(
α
−
γ
)
cos
(
β
−
γ
)
1
|
is equal to
jeemain
math
class12
ch4
determinants
evaluate-determinants
difficult
asked
Apr 23, 2014
by
sreemathi.v
1
answer
The roots of the equation
|
x
−
1
1
1
1
x
−
1
1
1
1
x
−
1
|
=
0
are
jeemain
math
class12
ch3
matrices
elementary-operation-(transformation)-of-a-matrix
medium
asked
Apr 23, 2014
by
sreemathi.v
1
answer
If a matrix A is such that
3
A
3
+
2
A
2
+
5
A
+
I
=
0
then its inverse is
jeemain
math
class12
ch3
matrices
invertible-matrices
medium
asked
Apr 23, 2014
by
sreemathi.v
1
answer
If
A
=
[
0
1
0
0
0
1
1
−
1
0
]
then
A
3
+
A
equals
jeemain
math
class12
ch3
matrices
operations-on-matrices
medium
asked
Apr 23, 2014
by
sreemathi.v
1
answer
If
A
and
B
are square matrices of the same order and A is non-singular then for a positive integer n,
(
A
−
1
B
A
)
n
is equal to
jeemain
math
class12
ch3
matrices
transpose-of-a-matrix
medium
asked
Apr 23, 2014
by
sreemathi.v
1
answer
If
a
,
b
,
c
are in A.P with common difference d and
|
x
+
1
x
+
a
x
+
b
x
+
a
x
+
b
x
+
c
x
−
b
+
1
x
−
1
x
−
a
+
c
|
has absolute value 2 then d is
jeemain
math
class12
ch3
matrices
elementary-operation-(transformation)-of-a-matrix
difficult
asked
Apr 23, 2014
by
sreemathi.v
1
answer
If
Δ
r
=
|
2
r
−
1
(
r
+
1
)
!
1
+
1
r
2
r
a
b
c
2
n
−
1
(
n
+
1
)
!
−
1
n
(
n
+
1
)
|
then value of
n
∑
r
=
1
Δ
r
is
jeemain
math
class12
ch4
determinants
evaluate-determinants
difficult
asked
Apr 23, 2014
by
sreemathi.v
1
answer
If
Δ
=
|
1
+
x
1
y
1
1
+
x
1
y
2
1
+
x
1
y
3
1
+
x
2
y
1
1
+
x
2
y
2
1
+
x
2
y
3
1
+
x
3
y
1
1
+
x
3
y
2
1
+
x
3
y
3
|
then
Δ
is
jeemain
math
class12
ch4
determinants
evaluate-determinants
medium
asked
Apr 22, 2014
by
sreemathi.v
1
answer
If
f
(
x
)
=
|
1
a
a
2
sin
(
n
−
1
)
x
sin
n
x
sin
(
n
+
1
)
x
cos
(
n
−
1
)
x
cos
n
x
cos
(
n
+
1
)
x
|
then
∫
π
2
0
f
(
x
)
d
x
is equal to
jeemain
math
class12
ch4
determinants
evaluate-determinants
difficult
asked
Apr 22, 2014
by
sreemathi.v
1
answer
If the system of equations
x
+
a
y
+
a
z
=
0
,
b
x
+
y
+
b
z
=
0
and
c
x
+
c
y
+
z
=
0
where
a
,
b
,
c
are non-zero ,non unity has a non-trivial solution then the value of
a
1
−
a
+
b
1
−
b
+
c
1
−
c
is
jeemain
math
class12
ch4
determinants
system-of-linear-equations
medium
asked
Apr 22, 2014
by
sreemathi.v
1
answer
In a triangle ABC
|
a
2
b
sin
A
C
sin
A
b
sin
A
1
cos
(
B
−
C
)
C
sin
A
cos
(
B
−
C
)
1
|
equals
jeemain
math
class12
ch4
determinants
area-of-a-triangle
medium
asked
Apr 22, 2014
by
sreemathi.v
1
answer
If
A
,
B
,
C
are angles of a triangle and
|
1
1
1
1
+
sin
A
1
+
sin
B
1
+
sin
C
sin
A
+
sin
2
A
sin
B
+
sin
2
B
sin
C
+
sin
2
C
|
=
0
jeemain
math
class12
ch4
determinants
area-of-a-triangle
medium
asked
Apr 22, 2014
by
sreemathi.v
1
answer
If
α
,
β
,
γ
are such that
α
+
β
+
γ
=
0
then
|
1
cos
γ
cos
β
cos
α
1
cos
α
cos
β
cos
α
1
|
is equal to
jeemain
math
class12
ch4
determinants
evaluate-determinants
difficult
asked
Apr 22, 2014
by
sreemathi.v
1
answer
If
f
(
n
)
=
|
n
1
5
n
2
2
r
+
1
2
r
+
1
n
3
3
r
2
3
r
+
1
|
then
r
∑
n
=
1
f
(
n
)
is
jeemain
math
class12
ch3
matrices
elementary-operation-(transformation)-of-a-matrix
difficult
asked
Apr 22, 2014
by
sreemathi.v
1
answer
If
S
r
=
|
2
r
x
n
(
n
+
1
)
6
r
2
−
1
y
n
2
(
2
n
+
3
)
4
r
3
2
n
r
z
n
3
(
n
+
1
)
|
then value of
n
∑
r
=
1
S
r
is independent of
jeemain
math
class12
ch3
matrices
operations-on-matrices
difficult
asked
Apr 22, 2014
by
sreemathi.v
1
answer
If
F
(
α
)
=
[
cos
α
−
sin
α
0
sin
α
cos
α
0
0
0
1
]
α
∈
R
then
[
F
(
α
)
]
−
1
is equal to
jeemain
math
class12
ch4
determinants
adjoint-and-inverse
medium
asked
Apr 22, 2014
by
sreemathi.v
1
answer
The repeated factor of
|
y
+
z
x
y
z
+
x
z
x
x
+
y
y
z
|
is
jeemain
math
class12
ch3
matrices
elementary-operation-(transformation)-of-a-matrix
medium
asked
Apr 22, 2014
by
sreemathi.v
1
answer
The value of
|
1
a
a
2
−
b
c
1
b
b
2
−
c
a
1
c
c
2
−
a
b
|
is
jeemain
math
class12
ch4
determinants
evaluate-determinants
medium
asked
Apr 22, 2014
by
sreemathi.v
1
answer
If
A
=
[
1
a
a
2
b
c
1
b
b
2
c
a
1
c
c
2
a
b
]
then
|
A
|
is
jeemain
math
class12
ch4
determinants
adjoint-and-inverse
medium
asked
Apr 22, 2014
by
sreemathi.v
1
answer
If
a
,
b
,
c
are non zero real numbers,then
|
b
c
c
a
a
b
c
a
a
b
b
c
a
b
b
c
c
a
|
vanishes when
jeemain
math
class12
ch3
matrices
equality-of-matrices
medium
asked
Apr 22, 2014
by
sreemathi.v
1
answer
If
f
(
x
)
=
{
x
3
+
x
2
−
16
x
+
20
(
x
−
2
)
2
w
h
e
n
x
≠
3
k
w
h
e
n
x
=
2
and
f
(
x
)
is continuous at
x
=
3
find the value of k.
jeemain
math
ch5
continuity-and-differentiability
continuity
difficult
asked
Apr 22, 2014
by
meena.p
1
answer
If
f
(
x
)
=
{
|
x
+
2
|
tan
−
1
(
x
+
2
)
x
≠
−
2
2
x
=
−
2
then
f
(
x
)
is
jeemain
math
ch5
continuity-and-differentiability
continuity
difficult
asked
Apr 22, 2014
by
meena.p
1
answer
If the function
f
(
x
)
=
{
3
a
x
+
b
f
o
r
x
>
1
11
f
o
r
x
=
1
5
a
x
−
2
b
f
o
r
x
<
1
is continuous at
x
=
1
.find the values of a and b .
jeemain
math
ch5
continuity-and-differentiability
continuity
difficult
asked
Apr 22, 2014
by
meena.p
1
answer
If
f
(
x
+
y
)
=
f
(
x
)
.
f
(
y
)
for all x and y and if
f
(
5
)
=
2
and
f
′
(
0
)
=
3
find
f
′
(
5
)
jeemain
math
ch13
limits and derivatives
derivatives
difficult
asked
Apr 22, 2014
by
meena.p
1
answer
Find the values of K. So that the function
f
(
x
)
=
{
k
cos
x
π
−
2
x
i
f
x
≠
π
2
3
i
f
x
=
π
2
is continuous at
x
=
π
2
.
jeemain
math
ch5
continuity-and-differentiability
continuity
difficult
asked
Apr 22, 2014
by
meena.p
1
answer
Determine the value of K so that the function.
f
(
x
)
=
{
K
x
2
i
f
x
≤
2
3
i
f
x
>
2
is continuous .
jeemain
math
ch5
continuity-and-differentiability
continuity
difficult
asked
Apr 22, 2014
by
meena.p
1
answer
Evaluate
lim
x
→
π
/
6
(
√
3
sin
x
−
cos
x
)
(
x
−
π
/
6
)
jeemain
math
ch13
limits and derivatives
limits-of-trigonometric-functions
medium
asked
Apr 22, 2014
by
meena.p
1
answer
Evaluate
lim
x
→
0
(
x
3
cot
x
1
−
cos
x
)
jeemain
math
ch13
limits and derivatives
limits of trigonometrix functions
medium
asked
Apr 22, 2014
by
meena.p
1
answer
Evaluate
lim
x
→
0
(
sin
2
x
+
sin
6
x
sin
5
x
−
sin
3
x
)
jeemain
math
ch13
limits and derivatives
limits of trigonometric funtions
easy
asked
Apr 22, 2014
by
meena.p
1
answer
Evaluate
lim
x
→
2
(
e
x
−
e
2
x
−
2
)
jeemain
math
ch13
limits and derivatives
introduction to limits
medium
asked
Apr 22, 2014
by
meena.p
1
answer
Define
f
(
0
)
so that
f
(
x
)
=
(
x
+
1
)
cot
x
becomes continuous at
x
=
0
jeemain
math
ch13
limits and derivatives
introduction to limits
easy
asked
Apr 22, 2014
by
meena.p
1
answer
If vertex and focus of hyperbola are
(
2
,
3
)
and
(
6
,
3
)
respectively and eccentricity e of the hyperbola is 2 then equation of the hyperbola is
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
medium
asked
Apr 21, 2014
by
meena.p
1
answer
Equation of the hyperbola with eccentricity
3
2
and foci at
(
±
2
,
0
)
is
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
difficult
asked
Apr 21, 2014
by
meena.p
1
answer
The eccentricity of the hyperbola
9
y
2
−
4
x
2
=
36
is
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
medium
asked
Apr 21, 2014
by
meena.p
1
answer
The distance between the foci of a hyperbola is
16
and its eccentricity is
√
2
. Its equation is
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
medium
asked
Apr 21, 2014
by
meena.p
1
answer
Equation of the chord of the hyperbola
25
x
2
−
16
y
2
=
400
which is bisected at the point
(
6
,
2
)
is
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
medium
asked
Apr 21, 2014
by
meena.p
1
answer
Find the equation of hyperbola if the distance between the foic is
16
,
e
=
√
2
and axis along x-axis with centre oxgin.
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
medium
asked
Apr 21, 2014
by
meena.p
1
answer
Find the equation of the tangents drawn from the point
(
−
1
,
−
2
)
to the hyperbola
2
x
2
−
3
y
2
=
6
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
difficult
asked
Apr 21, 2014
by
meena.p
1
answer
A rectangular hyperbola whose cetre is C is cut by any circle of radius r in four points
P
,
Q
,
R
and S. Then
C
P
2
+
C
Q
2
+
C
R
2
+
C
S
2
is equal to.
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
medium
asked
Apr 21, 2014
by
meena.p
1
answer
If angle between the asymptotcs of the hyperbola
x
2
a
2
−
y
2
b
2
=
1
is
45
∘
then value of eccentricity
e
is :
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
medium
asked
Apr 21, 2014
by
meena.p
1
answer
Equation of chord of the hyperbola
25
x
2
−
16
y
2
=
400
which is bisected at the point
(
6
,
2
)
is
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
medium
asked
Apr 21, 2014
by
meena.p
1
answer
If
e
and
e
′
be the eccentricities of a hyperbola and its conjugate then
1
e
2
+
1
e
12
is equal to
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
difficult
asked
Apr 21, 2014
by
meena.p
1
answer
The locus of a point
p
(
α
,
β
)
moving under the condition that the line
y
=
α
x
+
β
is a tangent to the hyperbola
x
2
a
2
−
y
2
b
2
=
1
is
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
medium
asked
Apr 21, 2014
by
meena.p
1
answer
A circle touches the x-axis and also touches the circle with centre at
(
0
,
3
)
and radius the circle with centre at
(
0
,
3
)
and radius 2. The locus of the center of circle is
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
medium
asked
Apr 21, 2014
by
meena.p
1
answer
If the foci of the ellipse
x
2
16
+
y
6
b
2
=
1
and the hyperbola.
x
2
144
−
y
2
81
=
1
25
coincide, then the value of
b
2
is
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
difficult
asked
Apr 21, 2014
by
meena.p
1
answer
Angle between the asymptotes of the hyperbola
3
x
2
+
7
x
y
+
2
y
2
−
11
x
−
7
y
+
10
=
0
is
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
difficult
asked
Apr 21, 2014
by
meena.p
1
answer
If
e
1
and
e
2
are the eccentricities of the hyperbolas
x
2
a
2
−
y
2
b
2
=
1
and
y
2
b
2
−
x
2
a
2
=
1
Then value of
1
e
2
1
+
1
e
2
2
is
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
medium
asked
Apr 21, 2014
by
meena.p
1
answer
The value of P for which the sum of squares of roots of equation
x
2
−
(
p
−
2
)
x
−
(
p
+
1
)
=
0
attains the least value is :
jeemain
math
class11
ch5
complex-numbers-and-quadratic-equations
quadratic-equations
medium
asked
Apr 15, 2014
by
sreemathi.v
1
answer
The vertices of the hyperbola
9
x
2
−
16
y
2
−
36
x
+
96
y
−
252
=
0
are
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
medium
asked
Apr 11, 2014
by
meena.p
1
answer
The diameter of
16
x
2
−
9
y
2
=
144
which is conjugate to
x
=
2
y
is
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
difficult
asked
Apr 11, 2014
by
meena.p
1
answer
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