Excercices a resoudre 1) (sin^4 x -cos^4 x ) = sin^2 x - cos^2 x
2) 1+ cotg^2 x = 1/sin^2 x
3) tgx cosx = sinx
4) tg^2 cos^2 x = 1
5) (1-cos^2 x )( 1+cotg^2 x ) = 1
Bonsoir , aide moi svpl ! Urgent
2) 1+ cotg^2 x = 1/sin^2 x
3) tgx cosx = sinx
4) tg^2 cos^2 x = 1
5) (1-cos^2 x )( 1+cotg^2 x ) = 1
Bonsoir , aide moi svpl ! Urgent
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