Formulaire de trigonométrie circulaire
2 (cos(a−b)−cos(a +b)) sin2 a = 1 −cos(2a) 2 sinacosb = 1 2 (sin(a+b)+sin(a−b)) Formules de factorisation cos x, sin x et tan x Divers en fonction de t=tan(x/2) cosp +cosq = 2cos p +q 2 cos p−q 2 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 ... ................
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