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Fleurale
@Fleurale
April 2019
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Bonjour pouvez vous m'aider SVP !!!
Démontrer que:
( cos (a) + sin (a) )² =1+2 × cos(a) ×sin(a)
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starvanessa1
On developpe ( cos(a) + sin (a) )² = (cos(a))²+2×cos(a)×sin(a)+(sin(a))² et on a cos² (a) + sin² (a) = 1 donc c'est 1+2×cos(a)×sin(a)
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