Выберите правильный ответ. производная функции y=(x^3+1)*cos2x равна (запишите решение)

1)y'=x^2*cos2x+(x^2+1)*sin2x
2)y'=3x^2*cos2x+(x^3+1)*sin2x
3)y'=3x^2*cos2x-(x^3+1)*sin2x
4)y'=3x^2*cos2x+2(x^3+1)*sin2x
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