Approximation (approximation) calculations

The University, 2015 .
He developed a service for the calculation of integrals, roots and interpolation of functions.
The interface of the input functions is simplified for the user: you can use 2x instead of 2*x, sin, cos, ^ to put in degree.
Developed with the help of a pure "vanal" javascript, calculations are carried out on the side of the client.