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If cos(theta+phi)=mcos(theta-phi) then t...

If `cos(theta+phi)=mcos(theta-phi)` then `tantheta` is equal to

A

`((1+m)/(1-m)) tan phi`

B

`((1-m)/(1+m)) tan phi`

C

`((-1m)/(1+m)) cot phi`

D

`((1+m)/(1-m)) cot phi`

Text Solution

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The correct Answer is:
A
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