1. For Windows or Linux - Press Ctrl+D
2. For MacOS - Press Cmd+D
3. For iPhone (Safari) - Touch and hold, then tap Add Bookmark
4. For Google Chrome - Press 3 dots on top right, then press the star sign
Enter your integral problem in the input field.
Press Enter on the keyboard or on the arrow to the right of the input field.
In the pop-up window, select “Find the Double Integral”. You can also use the search.
Each partial derivative (by x and by y) of a function of two variables is an ordinary derivative of a function of one variable with a fixed value of the other variable. Therefore, partial derivatives are calculated using formulas and rules for calculating the derivatives of functions of one variable, while counting the other variable as a constant.