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The value of cos A cos (60° – A) cos (60° + A) is equal to

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The value of cos A cos (60° – A) cos (60° + A) is equal to ________

(a) 1/2 cos 3A 

(b) cos 3A 

(c) 1/4 cos 3A 

(d) 4cos 3A

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Correct option is (c) 1/4 cos 3A 

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