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Answer to Question #2670 in Trigonometry for aidan

Question #2670

Prove that:&
cos (θ-φ ) - sin (θ+φ/2) =-2 cos θ

Expert's answer

This formula is not correct: If θ=φ=0, then The left-hand side is equal to & cos 0 – sin 0 = 1, while the right-hand side is -2cos0 = -2

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