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If tan ( theta/2)=t then ( 1-t^2 )/...

If ` tan ( theta/2)=t ` then ` ( 1-t^2 )/( 1+t^2)` is equal to

A

` cos theta `

B

`sin theta `

C

`sec theta `

D

`cos 2 theta `

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The correct Answer is:
A
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