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lolchipie89
@lolchipie89
January 2021
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Bonsoir,
ABC est un triangle rectangle en A.
On sait que cos B = 0,8
a. Quelle formule permet d'affirmer que :
sin² B = 1 - cos² B ?
b. En déduire sin² B, puis en sin B.
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A = -7 + 6 - 8 - 4 + 24 / (-3) + ( -7) x ( -8) B = - ( 4 x (-7)) + ( -5 x (-8)) + ( 6x9) - ((-36) / (-9))
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lolchipie89
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Pouvez-vous m'aider pour ces deux exercices de maths SVP? URGENT(POUR 20PTS!!!!!)
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