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

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

A

`cos 2 alpha.tan alpha = -1`

B

`cos 2 alpha.tan alpha = 1`

C

`cos 2 alpha - tan 2 alpha = 1`

D

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

लिखित उत्तर

Verified by Experts

The correct Answer is:
A, C
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