Bonsoir aide moi svpl ! Urgent 1) Soit a un angle aigu
Justifier les egalites suivantes

a) Cos^2 a -sin^2 a = 1-2sin^2 a = cos^2 a -1
b) ( Cos a + sin a = 1+2cos a sin a )
c) (Cos a -sin a = 1-2 sin a cos a )

Merci bcp ,
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