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If tanalpha+cotalpha=m then value of tan...

If `tanalpha+cotalpha=m` then value of `tan^4alpha+cot^4alpha` is

A

`m^4-4m^2+2`

B

`m^4+4m^2-2`

C

`m^4-4m^2-2`

D

`m^4+4m^2+2`

Text Solution

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The correct Answer is:
A
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