English, asked by agarwalmamta254, 9 months ago

15. Prove that: cos x cos x/2 - cos 3x cos 9x/2 = sin 4x sin 7x/2.

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Answered by sagarkag1947

0

Answer:

this is not maths section of brainly. this is the english section of brainly. kindly post math questions in its respective category.

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