RT Journal Article SR Electronic A1 LIŠKA, Vladimír A1 VRÁBEĽ, Róbert T1 JF Trends in education YR 2009 VO 2 IS 1 SP 484 OP 488 UL https://tvv-journal.upol.cz/en/artkey/tvv-200901-0111.php 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 .