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January 2021
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Bonsoir, besoin d'aide pour ces exercices de trigonométrie, merci d'avance
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nenette33
Cosπ/12=cos(π/3-π/4)=cosπ/3*cosπ/4+sinπ/3*sinπ/4
(car cos(a-b)=cosacosb+sinasinb)
=1/2*√2/2+√3/2*√2/2
=(√2+√6)/4
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(car cos(a-b)=cosacosb+sinasinb)
=1/2*√2/2+√3/2*√2/2
=(√2+√6)/4