Answer :
Given
On differentiating y with respect to x, we get
We know
[using chain rule]
We know
[using chain rule]
Recall that (quotient rule)
We know and derivative of a constant is 0.
(∵ sec2θ – tan2θ = 1)
But, cos2θ + sin2θ = 1 and cos2θ – sin2θ = cos(2θ).
Thus,
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If then
is equal to
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