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If `y= sec(tan^(-1) x)`, then `(dy)/(dx)` at `x=1` is

If `y= sec(tan^(-1) x)`, then `(dy)/(dx)` at `x=1` is

A.

`cos   pi/4`
B.

`sin   pi/2`

C.

`sin   pi/6`

D.

`cos   pi/3`

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