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exercice 2 svp merci

Exercice 2 Svp Merci class=

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bonjour,
cos²x +sin²x=1
cos xa=0.15
cos²x= 0.225
0.225+sin²x=1
sin²=1-0.225
sin²x=0.9775
sin x =√0.9775
9775=5x5x17x23
0.9775=5x5x0.17x0.23
√0.9775=√5x5x0.17x0.23=5√0.17x0.23=5√0.0391
sin x=5√0.0391