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if tantheta1=kcottheta2 then find cos(th...

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)`

Text Solution

Verified by Experts

The correct Answer is:
B
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