proCalc - Symbolic Derivate an

Many times during my undergrad studies at Brigham Young University Idaho, I wanted a calculator on my phone that did more than a scientific calculator. So I made my own, proCalc. I use it all the time, and now you can to!

Features:
- Full history of what has been entered
- Solve Simple Equations
- Symbolic Math
- Graphing Calculator
- Symbolically Evaluate Derivatives
- Symbolically Evaluate Integrals

Math Functions:
- log
- ln
- cos
- sin
- tan
- exp
- sqrt

Coming Math Functions:

- acos
- asin
- atan
- sec
- csc
- cot
- floor
- transpose
- acos
- ceil
- Si
- Ci
- Ei
- rect
- step
- sinc
- Shi
- Chi
- fact
- factorial
- dfactorial
- mod
- erf
- round
- pfactor
- expand
- fib
- tri

Examples:

1 + 1 = 2

39/9 = 13/3

cos(pi/3) = 1/2

a + 2*a = 3*a

diff(x^2,x) = 2*x

Integrate(x^2,x) = (1/3)*x^3

Note:
- This is still a work in progress and there are still some bugs to be worked out. So feel free to let me know if you find any issues, and let me know what other features I should add next.