PT Journal AU LISKA, V VRABEL, R SO Trends in education PY 2009 BP 484 EP 488 VL 2 IS 1 DE three-dimensional integral; Fubini's theorem; cylindrical coordinates. AB Substitution method to multidimensional integrals is a powerful tool for calculating them, but its routine application can lead to lengthy calculations. This fact presents the example of three-dimensional integral, where the area of integration is cone with the axis of rotation ox . ER