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

If `cos(theta+phi)= mcos(theta-phi)`, then prove that `tan theta=(1-m)/(1+m)cotphi`.

A

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

B

`(1-m)/(1+m)tanphi`

C

`(1-m)/(1+m)cotphi`

D

`(1+m)/(1-m)secphi`

Text Solution

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The correct Answer is:
C
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  13. If A+C=2B, then (cosC-cosA)/(sinA-sinC)=

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