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Differential coefficient of sec(tan^(-1)...

Differential coefficient of `sec(tan^(-1) x)` is

A

`x/sqrt(1+x^(2))`

B

`x/(1+x^(2))`

C

`xsqrt(1+x^(2))`

D

`1/(sqrt(1+x^(2))`

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The correct Answer is:
A
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