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If tan ""(theta)/(2)= t, then the value ...

If `tan ""(theta)/(2)`= t, then the value of `(1- t ^(2))/(1+t^(2)) ` is

A

` cos theta `

B

`sin theta `

C

`sec theta `

D

`cos 2 theta `

Text Solution

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The correct Answer is:
A
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