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

If `y=cos^(-1)(cosx)`,then `(dy)/(dx)` at x=`(5pi)/4` is equal to
(a)1 (b)-1 (c)0 (d)4

A

1

B

`-1`

C

`1/sqrt2`

D

`sqrt2`

Text Solution

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The correct Answer is:
B
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