Graph Improvements

I am working on improving graphing for the next update.  Currently, you are forced to enter equations in the format y=...  In the next update this will change.  The "y=" part will be removed so you are free to enter equations such as x^2+y^2=1 to draw a circle.  You can also enter equations to draw ellipses, hyperbola, and inverse functions.  For example, you could graph y=x^2-2x+1 and then graph the inverse at the same time by swapping x and y to graph x=y^2-2y+1.

In addition, there will be some improvement to how the traces are drawn.  For example, when you currently graph y=tan(x) and zoom out far enough, you will not see y go to + and - infinity when x=pi/2.  Instead the trace will just stop at a random y value and the start again at some -y value.  This will be fixed and now y=tan(x) will always be drawn off the top and bottom of the screen when x=pi/2.

I am also working to add the ability to graph parametric equations and polar coordinates to the paid version.