Math, asked by dadhwallovely5, 7 months ago

Prove that
(i) (cos x + cos y)2 + (sin x + sin y)2 = 4 cos
4 cos2*
2x - y
2

Answers

Answered by nishachauhan11781

Answer:

jdjwkxjcrjfjkskxkcjndnsmsmckkfjrjejcjvjddjjccj

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