# Integral Calculator with step-by-step Explanations

The following variables and constants are reserved:

• e = Euler's number, the base of the exponential function (2.718281...)
• i = imaginary number (i² = -1)
• pi, π = the ratio of a circle's circumference to its diameter (3.14159...)
• phi, Φ = the golden ratio (1,6180...)
• t, u and v are used internally for integration by substitution and integration by parts

You can enter expressions the same way you see them in your math textbook. Implicit multiplication (5x = 5*x) is supported. If you are entering the integral from a mobile phone, you can also use ** instead of ^ for exponents. The interface is specifically optimized for mobile phones and small screens.

## Supported integration rules and methods

The calculator decides which rule to apply and tries to solve the integral and find the antiderivative the same way a human would.