Mark (√) against the correct answer in the following:
If
?
Given that ![]()
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Since tan2x=sec2x-1, therefore

Hence,
or ![]()
Let x=tanθ ⇒ θ=tan-1x
Hence, ![]()
Using
, we get
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Using -tan x=tan(-x), we get
![]()
Differentiating with respect to x, we get
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