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If tan alpha + cot alpha=a, then the val...

If `tan alpha + cot alpha=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^(2) + 2a^(2) + 4`

Text Solution

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The correct Answer is:
B
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