If t a ntheta1t a ntheta2=k , then ("cos...

If `t a ntheta_1t a ntheta_2=k ,` then `("cos"(theta_1-theta_2))/("cos"(theta_1+theta_2))=` `(1+k)/(1-k)` b. `(1-k)/(1+k)` c. `(k+1)/(k-1)` d. `(k-1)/(k+1)`

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