3) f(x) = 3Cosx - 4Sinx
F(x) = 3Sinx + 4Cosx + C
4) f(x) = 5Sinx + 2Cosx
F(x) = -5Cosx + 2Sinx + C
5) f(x) = x² + 3*x^-1/2
F(x) = x³/3 + 3x^1/2 :1/2 + C = x³/3 + 6√x + C
6) f(x) = x³ - 4 x^-1/2
F(x) = x⁴/4 -4х^1/2 : 1/2 + С = x⁴/4 -8√x + C
7) f(x) = Sin(3x + π/3)
F(x) = - 1/3*Cos(3x + π/3) + C
8) f(x) = Cos(2x + π/6)
F(x) = 1/2*Sin(2x + π/6) + C