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並前往https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:trig/x9e81a4f98389efdf:trig-id/v/trigonometry-unit-circle-symmetry

Sine & cosine identities: symmetry (video) - Khan Academy

Sal finds several trigonometric identities for sine and cosine by considering horizontal and vertical symmetries of the unit circle.

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