यदि cot^(3) alpha + cot^(2) alpha + cot ...

यदि `cot^(3) alpha + cot^(2) alpha + cot alpha = 1` है, तो

A

`cos 2alpha.tan alpha=-1`

B

`cos 2alpha.tan alpha=1`

C

`cos 2alpha-tan 2alpha=1`

D

`cos 2alpha-tan 2alpha=-1`

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The correct Answer is:

A, C

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