1.

A : If x=sin(alpha - beta ) sin (gamma - delta), y=sin(beta - gamma ) sin (alpha - delta) , z=sin(gamma - alpha ) sin ( beta - delta) " then " x+y+z=0 R :2 sin A sin B = cos(A-B)+cos(A+B)

Answer»

A is TRUE , R is true and R is CORRECT explanation of A
A is true , R is trueand R is not correct explanation of A
A is true , R is FALSE
A is false , R is true

ANSWER :C


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