Write the product as a sum. cos 7x cos 3x

(a) cos 7x cos3 x
(b) [cos7x cos3x]/ 2
(c) [cos10x cos 4x]/ 2
(d) -[cos5x + cos 2x]/ 2
(e) none of these


(c) [cos10x cos 4x]/ 2

Mathematics

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