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If tan alpha +cot alpha =a then the valu...

If `tan alpha +cot alpha =a` then the value of `tan^(4) alpha +cot^(4) alpha=`

A

`a^(4)+4a^(2)+2`

B

`a^(4)-4a^(2)+2`

C

`a^(4)-4a-2`

D

none of these

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The correct Answer is:
B
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