Si x est un angle aigu.Calculer Sin x ,tgx et cotg x. Sachant que Cos x=1/3. 2- a) Calculer de deux façons sin x sachant que : Cos x = 3/4 et tg x= √7/3. b) Sachant que Cos B= 3sinB. Calculer les valeurs exactes de tg B, sin B et Cos B.
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