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dju07
@dju07
December 2021
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Soit x appartenant à [-π/2 ; 0], on sait que cos(x) = 3/4. Après avoir rappelé le signe de sin(x), déterminer sa valeur exacte.
On rappelle que sin²(x) + cos²(x) = 1.
Merci d'avance :)
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