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Which of the following pair of functions...

Which of the following pair of functions are identical

A

`f(X)=sin^(2)x+cos^(2)x` and `g(x)=1`

B

`f(x)=sec^(2)x-tan^(2)x` and `g(x)=1`

C

`f(x)=cosec^(2)x-cot^(2)x` and `g(x)=1`

D

`f(x) =lnx^(2)` and `g(x)=2lnx`

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The correct Answer is:
A
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