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"If "y=sec (tan^(-1)x)," then "(dy)/(dx)...

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

A

`1//sqrt(2)`

B

`1//2`

C

`1`

D

`sqrt(2)`

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The correct Answer is:
A
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