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If tantheta1=kcottheta2 then (cos(theta1...

If `tantheta_1=kcottheta_2` then `(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)`

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