1.

A :cos^(3) x + cos^(3)(120^@ + x) + cos^(3)(120^(@) - x)=(3)/(4) cos 3 x R :cos theta + cos (120^(@) + theta ) cos (120^(@) - theta ) = 0 and cos thetacos(120^(@) + theta ) cos (120^(@) - theta ) = (1)/(4) cos 3 theta

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 :A


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