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Manonnulenmaths
@Manonnulenmaths
April 2019
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Démontre que :
[cos(a) + sin(a)] (le tout à carré) = 1 + 2 x cos(a) x sin(a)
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danielwenin
Verified answer
(cosa + sina)² = cos²a + 2sina x cosa + sin²a = (cos²a + sin²a) + 2sina x .cosa
= 1 + 2sina x cosa
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Thanks 1
manonnulenmaths
merci beaucoup !
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aide en maths svp Exercice 31 et 32 je comprend absolument rien, merci de m'aider :)
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Verified answer
(cosa + sina)² = cos²a + 2sina x cosa + sin²a = (cos²a + sin²a) + 2sina x .cosa= 1 + 2sina x cosa