Prove that: cos(2x-3y)+ cos3y = cot a sin(2x-3y)+ sin3y
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Hello, math123456! You have a typo . . . Prove that: . We need two Sum-to-Product identities: . . . . Numerator: Denominator: The fraction becomes: .
Originally Posted by math123456 Prove that: cos(2x-3y)+ cos3y = cot a sin(2x-3y)+ sin3y Use the identities and . So .
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