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If cot^3alpha +cot ^2 alpha + cot alpha ...

If `cot^3alpha +cot ^2 alpha + cot alpha =1` then

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`

Text Solution

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The correct Answer is:
A, C
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