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Si te das Cuenta No son iguales:
cosx.sen2x = sen3x
pero sen3x = sen(x+2x)
sen(x+2x) = senx.cos2x+cosx.sen2x
cosx.sen2x = enx.cos2x+cosx.sen2x
0 = senx.cos2x
No Hay Igualdad
Saludos Juan Soto.