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Differentiate log(tan^(-1)x) with respec...

Differentiate `log(tan^(-1)x)` with respect to `x` :

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{ let } `y=log (tan ^{-1} x)`
`therefore frac{d}{d x}(log x)=frac{1}{x} cdot frac{d x}{d x}`
`frac{d y}{d x}=frac{1}{tan ^{-1} x} cdot frac{d}{d x}(tan ^{-1} x) `
because `frac{d}{d x}(tan ^{-1} x)=frac{1}{1+x^{2}}`
`frac{d y}{d x}=frac{1}{tan ^{-1} x} cdot(frac{1}{1+x^{2}}) ` ...
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