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Sagot :

MOZI
Bonsoir


On not x au carré x^2
Et Vn la racine carré de n

(cos x)^2 = 7/25
Or (sin x)^2 = 1 - (cos x)^2 = 1 - 7/25 = 18/25
Donc sin x = 3V2 / 5

D’autre part tan x = sin x / cos x
= 3V2 / V7 = 3V14 / 7

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