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Michonne15
@Michonne15
January 2021
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Bonsoir, j'ai besoin de vous !!!! J'ai un petit exercice de Maths à faire pour demain mais je n'y arrive pas du tout... Aidez-moi ! S'il vous plaît
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scoladan
Verified answer
Bonjour,
1) vrai
sin(x) = 0,6
==> [sin(x)]^2 = 0,36
==> [cos(x)]^2 = 1 - 0,36
==> [cos(x)]^2 = 0,64
==> |cos(x)| = 0,8
2) FAUX
sin(x) = 1/2
==> x = pi/6 OU x = 5pi/6 sur [-pi, pi]
3) VRAI
sin(pi/2) = 1 donc condition suffisante
4) FAUX
cos(pi - x) = cos(pi)cos(x) + sin(pi)sin(x)
= -cos(x)
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Thanks 1
Michonne15
Oh merci infiniment ! ça fait des jours que je poste ce devoir & personne ne me répondait! Merciiii :-)
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Lista de comentários
Verified answer
Bonjour,1) vrai
sin(x) = 0,6
==> [sin(x)]^2 = 0,36
==> [cos(x)]^2 = 1 - 0,36
==> [cos(x)]^2 = 0,64
==> |cos(x)| = 0,8
2) FAUX
sin(x) = 1/2
==> x = pi/6 OU x = 5pi/6 sur [-pi, pi]
3) VRAI
sin(pi/2) = 1 donc condition suffisante
4) FAUX
cos(pi - x) = cos(pi)cos(x) + sin(pi)sin(x)
= -cos(x)