Great app!!

I am engineering student and have used this primarily for the calculations for my homework for 3 and 1/2 years now. It has been fantastic never had any problems. Copying and pasting previously typed equations is a nice feature as well as the derivatives and integrals. Matrices a big plus. Besides the graphing feature my TI-84 has (which I have to use in class unfortunately), this calculator is the best. The logic even works nicely for using variables. At least 5 people have purchased from how easily they see me using it.

nick nack fanny pack about Equation Calculator