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Which of the following pairs of function...

Which of the following pairs of function are identical?

A

`f(x)=e^(In sec^(-1)x) " and " g(x)=sec^(-1)x`

B

`f(x)=tan(tan^(-1)x) " and " g(x)=cot(cot^(-1)x)`

C

f(x)=sgn(x) and g(x)=sgn(sgn(x))

D

`f(x)=cot^(2)*cos^(2)x " and " g(x)=cot^(2)x-cos^(2)x`

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The correct Answer is:
B, C, D
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