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zoukenziee
@zoukenziee
January 2021
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Aidez moi sil vous plait
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ProfdeMaths1
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Ex 3 :
(1-cos(x))(1+cos(x))=1²-cos²(x)=sin²(x)
donc (1-cos(x))/sin(x)=sin(x)/(1+cos(x))
(1-sin(x))(1+sin(x))=1²-sin²(x)=cos²(x)
donc cos(x)/(1-sin(x))=(1+sin(x))/cos(x)
(cos(x))^4-(sin(x))^4=(cos²(x)-sin²(x))(cos²(x)+sin²(x))
=cos²(x)-sin²(x)
=cos²(x)-(1-sin²(x))
=2cos²(x)-1
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Thanks 1
zoukenziee
Merci
zoukenziee
Et pour la suite
zoukenziee
S'il vous plaît
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Jai besoin d'aide pour les exercices 2 et 3 sil vous plait je veux les explications car je n'y arrive vraiment pas. Merci d'avance
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Quelqu'un peut maider pour lexercice 3 et 4 sio vous plait Merci
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Verified answer
Ex 3 :(1-cos(x))(1+cos(x))=1²-cos²(x)=sin²(x)
donc (1-cos(x))/sin(x)=sin(x)/(1+cos(x))
(1-sin(x))(1+sin(x))=1²-sin²(x)=cos²(x)
donc cos(x)/(1-sin(x))=(1+sin(x))/cos(x)
(cos(x))^4-(sin(x))^4=(cos²(x)-sin²(x))(cos²(x)+sin²(x))
=cos²(x)-sin²(x)
=cos²(x)-(1-sin²(x))
=2cos²(x)-1