Q. 39

# Mark (√) against

Given that

Let x=-cosθ θ=cos-1(-x).

Using and , we get

Differentiating with respect to x, we get

–(1)

Since, x=-cosθ or -(2)

Also, since θ=cos-1(-x), therefore –(3)e

Substituting (2) and (3) in (1), we get

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