# If <i

As the expression for y is quite complicated. So we need to simplify it before differentiation.

For simplification we can use idea like:

1 + cos 2θ = 2cos2θ or 1 - cos 2θ = 2sin2θ

For simplifying y, put x2 = cos 2θ

y = y = y = Dividing numerator and denominator by cos θ

y = y = y = Now differentiating y w.r.t x, we get – x2 = cos 2θ sin 2θ = Differentiating the equation above w.r.t θ-  From above we have a value of sin 2θ  Rate this question :

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