x est la mesure d'un angle aigu, simplifier les expressions suivantes : B = cos⁴ + 2 cos²x ×sin² x+sin⁴ x
C = sin⁴x-sin² x + cos²x- cos⁴ x
D = cos²x - cos² x × sin² x - cos⁴ x
E= 2 /cos² - 1 /1+sin - 1/1-sin x​
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