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If cot^(3)alpha+cot^(2)alpha+cot alpha=1...

If `cot^(3)alpha+cot^(2)alpha+cot alpha=1` then which of the following is/are correct :

A

`cos2alpha tan alpha=1`

B

`cos2alpha*tan alpha= -1`

C

`cos2alpha-tan2alpha=-1`

D

`cos2alpha-tan2alpha=1`

Text Solution

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The correct Answer is:
B, D
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