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If cot^(-1)(sqrt(sinalpha))+tan^(-1)(sqr...

If `cot^(-1)(sqrt(sinalpha))+tan^(-1)(sqrt(sinalpha))=u,"then"cos2u"is equal to"`

A

`tan^(2)alpha`

B

`0`

C

`-1`

D

`tan 2 alpha`

Text Solution

Verified by Experts

The correct Answer is:
C
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