Formulaire de trigonométrie circulaire
cosx = 1 −t2 1 +t2 1+cosx = 2cos2 x 2 cosp −cosq = −2sin p+q 2 sin p −q 2 sinx = 2t 1 +t2 1−cosx = 2sin2 x 2 sinp +sinq = 2sin p+q 2 cos p −q 2 tanx = 2t 1 −t2 cos(3x) = 4cos3 x−3cosx sinp −sinq = 2sin p−q 2 cos p +q 2 sin(3x) = 3sinx−4sin3 x Résolution d’équations cosx = cosa ⇔ sinx = sina ⇔ tanx = tana ⇔ ... ................
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