1.

A :cos 20^(@) + cos 100^(@) + cos 140^(@) =0 . R :cos theta + cos (120^(@) - theta ) + cos (120^(@) + theta ) =0

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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