Which of the following pairs of function...

Which of the following pairs of functions is/are identical? (a) `f(x)="tan"(tan^(-1)x)a n dg(x)="cot"(cot^(-1)x)` (b)`f(x)=sgn(x)a n dg(x)=sgn(sgn(x))` (c)`f(x)=cot^2xdotcos^2xa n dg(x)=cot^2x-cos^2x` (d)`f(x)=e^(lnsec^(-1)x)a n dg(x)=sec^(-1)x`

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