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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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