Explain in one sentence why both and appear in the general solution of the equation .

MATHEMATICS · Subjective · AP · AP Precalculus · Trigonometric and Polar Functions · Trigonometric and Polar Functions

Problem

Explain in one sentence why both +α+\alpha and −α-\alpha appear in the general solution of the equation cos⁡x=cos⁡α\cos x = \cos \alpha.

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