1.

A : cos 40^(@) cos 80^(@) cos 160^(@) =-1//8 R :cos theta cos (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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