Svp les amis aidez moi j'ai besoin de votre aide calculer:A=cos34+cos47-sin56+cos43
B=tan70*tan20-tan45
C=cos50(sin40+cos50)+sin50(cos40+sin50)
D=racine2 * cos45+2sin30
E=3tan30+2cos60
mrc d'avance
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