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

Differential coefficient of `sec(tan^(-1)x)` is (a)`x/(1+x^2)` (b) `xsqrt(1+x^2)` (c) `1/(sqrt(1+x^2))` (d) `x/(sqrt(1+x^2))`

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Let `y = sec(tan^(-1)x)`
We know derivative of `sec x = sec x tan x `
Derivative of `tan^ (-1)x = 1/(1+x^2)`
Let `tan^(-1)x = t` ...
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