Q39 of 292 Page 569

Mark (√) against the correct answer in the following:

If ?


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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