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Dija34
@Dija34
December 2020
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Aidez moi SVP
9. Démontrer que pour tout nombre réel x, on a :
• sin^4 x + cos^4 x = 1 - 2 sin^2x cos^2x;
sin^6x + cos^6x = 1 - 3 sin^2x cos^2x.
(On pourra remarquer que, pour tous nombres réels a
et b: (a + b)^3 = a^3 + 3a²b + 3ab^2 + b^3.)
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