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CBSE XII
>>
Math
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Continuity and Differentiability
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Q)
Given that
cos
x
2
.
cos
x
4
.
cos
x
8
.
.
.
.
.
.
.
=
sin
x
x
,
P
r
o
v
e
t
h
a
t
1
2
2
sec
2
x
2
+
1
2
4
sec
2
x
4
+
.
.
.
.
.
.
.
=
c
o
s
e
c
2
x
−
1
x
2
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