Graphing calculator on Desmos is available on phone apps, so students could graph functions and verify their solutions easily on their phone during class. It is also free, saving students from purchasing $100 graphing calculators.

Desmos is the best for solving unknown variables; all you have to do is type in the equation and Desmos will calculate it for you! Desmos has the trig functions ready to click on, which we use several times in Geometry, so you don't have to type it out!

You could also type in a function and Desmos will graph it for you, as shown in the picture below. If you need to show your students what the function would look like, project this on the screen; no need to graph this by hand.