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If y = cos^(-1)(cos x) then dy/dx at x =...

If `y = cos^(-1)(cos x)` then `dy/dx` at `x = (5pi)/4` is (i)`1` (ii)`-1` (iii)`1/sqrt2` (iv) `sqrt2`

A

1

B

`-1`

C

`1/sqrt2`

D

`sqrt2`

Text Solution

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The correct Answer is:
B
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