4 Free Online Mathematics Problem Solvers (With Steps)
2. WebMath.com – Solve Your Maths Problem
To solve mathematics problems with this site, go to www.webmath.com. Under the Welcome to Webmath! section, you can click on the dropdown section and choose the topic for which you want a problem solved. You can type in your question in the space bar that shows up and click on whatever button is there to solve the problem.

As an example for the trigonometry problem, try typing sin(x)^2+cos(x)^2 and see what you get.