Public b As Single
Public a As Single
Public Function f(d)
f = (Sqr(d - 15) / Sqr(d + 3)) + 2 * (Cos(d) / (2 * Sin(d * 2)))
End Function
Private Sub Command1_Click()
a = 20 'Нижний предел
b = 40 'Верхний предел
h = 1 ' Шаг
integral = 0
For d = a To b - h Step h
integral = integral + h * f(d)
Next d
Text1.Text = Round(Abs(integral), 3)
End Sub