If y=log(x^(2)+sqrt(x^(4)-a^(4)))," then...

If `y=log(x^(2)+sqrt(x^(4)-a^(4)))," then "y_(1)sqrt(x^(4)-a^(4))=`

A

x

B

2x

C

3x

D

4x

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The correct Answer is:

B

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