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If tan alpha + cot alpha =m, then: tan^(...

If `tan alpha + cot alpha =m`, then: `tan^(4)alpha +cot^(4)alpha=`

A

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

B

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

C

`m^(4) - 4m^(2)-2`

D

`m^(4) + 4m^(2)+2`

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The correct Answer is:
A
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