If `t a ntheta_1t a ntheta_2=k ,`then `("cos"(theta_1-theta_2))/("cos" – InterviewSolution

1.	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)`A. `(1+k)/(1-k)`B. `(1-k)/(1+k)`C. `(k+1)/(k-1)`D. `(k-1)/(k+1)`
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