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If tanalpha=sqrt(a), where a is a ration...

If `tanalpha=sqrt(a)`, where a is a rational number whch is not a perfect square, then which of the following is a rational number?

A

`sin2alpha`

B

`tan2alpha`

C

`cos2alpha`

D

`" cosec "2alpha`

Text Solution

Verified by Experts

The correct Answer is:
C
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