Math / Trigonometry / Proof: cos(a+b) = (cos a)(cos b)-(sin a)(sin b)

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 Proof: sin(a+b) = (cos a)(sin b) + (sin a)(cos b) Proof: cos(a+b) = (cos a)(cos b)-(sin a)(sin b) Trigonometry : Proof of A sin x + B cos x = R sin (x + a) : ExamSolutions Addition formulae Sin(A+B), Cos(A+B), Tan (A+B): ExamSolutions cos(A+B) Trigonometry : Proof of A cos x - B sin x = R cos (x + a) : ExamSolutions Trigonometry : Proof of A sin x - B cos x = R sin (x - a) : ExamSolutions Trigonometry Equations : A cos x - B sin x = C Type : ExamSolutions Proof of A cos x + B sin x = R cos (x - alpha) : ExamSolutions Difference angle formula for Cosines: The geometric proof

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