# 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, Rate this question :

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