Prove that (d)/(dx)(cos^(-1)x)=(-1)/(sqr...

Prove that `(d)/(dx)(cos^(-1)x)=(-1)/(sqrt(1-x^(2))`, where `x in [-1,1].`

A

`-1 lt x lt 1`

B

`-1 le x lt 1`

C

`-1 le x le 1`

D

`-1 lt x le 1`

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The correct Answer is:

A

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