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Posted

Coucou !

sin (2A) = sin (A+A)

              = sin(A)cos(A) + sin(A)cos(A)

              =2sin(A)cos(A)

0.5 * sin (2A) = 0.5 * 2sin(A)cos(A)

0.5 * sin (2A) = sin(A)cos(A)

Posted
il y a 44 minutes, Insolence a dit :

Coucou !

sin (2A) = sin (A+A)

              = sin(A)cos(A) + sin(A)cos(A)

              =2sin(A)cos(A)

0.5 * sin (2A) = 0.5 * 2sin(A)cos(A)

0.5 * sin (2A) = sin(A)cos(A)

parfait merci !!!

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