\(\cos^2(x) + \sin^2(x) = 1\)
Symétries : \(\sin(\pi - x) = \sin(x)\), \(\cos(\pi - x) = -\cos(x)\)
Valeurs remarquables : \(\sin(\pi/6) = 1/2\), \(\cos(\pi/4) = \sqrt{2}/2\)
Périodicité : \(\sin(x \pm 2k\pi) = \sin(x)\)
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