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Differentiate \( (x^2-5x+8)(x^2+7x+9)\) in three ways mentioned : (i) by using product rule (ii) by expanding the product to obtain a single polynomial (iii) by logarithmic differentiation. Do they all give the same answer?
cbse
class12
modelpaper
2012
sec-b
q15
math
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asked
Jan 10, 2013
by
thanvigandhi_1
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votes
1
answer
Differentiate $ (x^2 - 5x + 8) (x^3 + 7x + 9 ) $ in three ways mentioned below:\begin{array}{1 1} (i)\;by\;using\;product\;rule & \;\\(ii)\;by\;expanding\;the\;product\;to\;obtain\;a\;single\;polynomial. & \;\\ (iii)\;by\;logarithmic\;differentiation. & \;\end{array} Do they all give the same answer?
asked
Nov 17, 2012
by
thanvigandhi_1
cbse
class12
bookproblem
ch5
sec5
q17
p178
easy
sec-c
math
0
votes
0
answers
If \( u, v \: and \ w \) are function of \( x\) , then show that $ \large\frac{d}{dx}(u.v.w) = \frac{du}{dx}.v.w+u.\frac{dv}{dx}.w+u.v.\frac{dw}{dx}$In two ways first by repeated application or product rule, secondly by logatithmic differentiation.
asked
Jan 10, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-b
q16
math
0
votes
1
answer
If $u,\: v$ and $w$ are functions of $x$, then show that $\large\frac{d}{dx} $$( u.v.w) =\large \frac{du}{dx} $$v.w + u . \large\frac{dv}{dx} $$. w + u.v. \large\frac{dw}{dx} $ in two ways - first by repeated application of product rule, second by logarithmic differentiation.
asked
Nov 17, 2012
by
thanvigandhi_1
cbse
class12
bookproblem
ch5
sec5
q18
p179
medium
sec-b
math
0
votes
0
answers
Two firms X and Y decided to award prizes to their employees for three norms Obedience (O), Punctual (P), Quality of work (Q). Firm X decided to award Rs. 40000 for the three values to 2, 4, 7 employees respectively while Y decided to award Rs. 51000 to 4, 2, 8 employees respectively. If all the three prizes together amount to Rs. 8750, then (i) Represent the above situation by a matrix equation and form linear equation using matrix multiplication. (ii) Is it possible to solve the system of linear equations so obtained using matrices? (iii) Which value you prefer to be rewarded most and why?
asked
Jan 23, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-b
q13
math
0
votes
0
answers
Principal and staff of a school decided to award prizes to their students for three values Honesty (x) cleanliness (y), Punctuality (z) in two groups. Group A ( upto class VIII) and group B ( IX - XII). It is decided that Rs. 12000 for three values (x, y, z) for 3, 4, 5 students of Group A and Rs. 11040 for 5, 4, 3 student of group B respectively. If all the three prizes together amount to Rs. 2880, then (i) Represent above situation by a matrix equation and form linear equation using matrices. (ii) Is it possible to solve the system of linear equations so obtained using matrices? (iii) Which value you prefer to be rewarded most and why?
asked
Jan 21, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-b
q13
math
0
votes
0
answers
Probability of solving a mathematical problem by A, B and C respectively are $\large\frac{1}{3}, \frac{1}{2}$$ \: and \: \frac{1}{4} $. If they try to solve the problem independently, find the probability that : (i) the problem is solved (ii) exactly one of them solve the problem (iii) exactly two of them solve the problem (iv) what do you think that problem solving attitude from books helpful in real life also?
asked
Jan 16, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-c
q29
math
0
votes
1
answer
Prove that \( tan^{-1} \bigg(\frac{\large 1}{\large 4} \bigg) + tan^{-1} \bigg( \frac{\large 2}{\large 9} \bigg ) = \frac{\large 1}{\large 2} cos^{-1} \bigg( \frac{3}{5} \bigg). \)
asked
Dec 26, 2012
by
thanvigandhi_1
cbse
modelpaper
2012
sec-b
q12
ch2
medium
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