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Which one of the following pair of funct...

Which one of the following pair of functions are NOT identical?

A

`e^((lnx)//2)` and `sqrt(x)`

B

`tan(tanx)` and `cot(cotx)`

C

`cos^(2)x+sin^(4)x` and `sin^(2)x+cos^(4)x`

D

`(|x|)/x` and `sgn(x)` where `sgn(x)` stands for signum function.

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The correct Answer is:
A, B, D
NA
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