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If tanalpha + cotalpha= a, then the valu...

If `tanalpha + cotalpha= a`, then the value of `tan^4 alpha +cot^4 alpha ` is equal to

A

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

B

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

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
C
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