If tantheta1=kcottheta2, then find cos(t...

If `tantheta_1=kcottheta_2,` then find `cos(theta_1-theta_2)/cos(theta_1+theta_2)=`................ A) `(1+k)/(1-k)` B) `(1-k)/(1+k)` C) `(k+1)/(k-1)` D) `(k-1)/(k+1)`

A

`(1+k)/(1-k)`

B

`(1-k)/(1+k)`

C

`(k+1)/(k-1)`

D

`(k-1)/(k+1)`

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The correct Answer is:

B

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