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If int(x^2-2)/((x^4+5x^2+4)tan^-1((x^2+2...

If `int(x^2-2)/((x^4+5x^2+4)tan^-1((x^2+2)/x))dx=log|f(z)|+c`, then (A) `f(z)=tan^-1z`, where `z=sqrt(x+2)` (B) `f(z)=tan^-1z`, where `z=x+2/x` (C) `f(z)=sin^-1z`, where `z=(x+2)/x` (D) none of these

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