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david311
@david311
January 2021
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Bonjour je suis complètement bloqué je ne vois pas par où commencer pouvez-vous m’aider s’il vous plaît
C’est de la trigonométrie le 92
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ProfdeMaths1
Verified answer
A=sin(2π/5)+sin(4π/5)+sin(6π/5)+sin(8π/5)
=sin(2π/5)+sin(4π/5)+sin(2π-4π/5)+sin(2π-2π/5)
=sin(2π/5)+sin(4π/5)+sin(-4π/5)+sin(-2π/5)
=sin(2π/5)+sin(4π/5)-sin(4π/5)-sin(2π/5)
=
0
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Thanks 2
david311
Mercii bcp je n’avais pas pensée à enlever des tour !
ProfdeMaths1
de rien
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Verified answer
A=sin(2π/5)+sin(4π/5)+sin(6π/5)+sin(8π/5)=sin(2π/5)+sin(4π/5)+sin(2π-4π/5)+sin(2π-2π/5)
=sin(2π/5)+sin(4π/5)+sin(-4π/5)+sin(-2π/5)
=sin(2π/5)+sin(4π/5)-sin(4π/5)-sin(2π/5)
=0