# If <img sty

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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