This is the best Graphing Calculator for WP and it is FREE now in most countries(except USA, China & Hong Kong SAR)!
- includes a powerful and easy to use scientific calculator
- cartesian, polar ,parametric & implicit functions plot
- save functions image to picture
- polynomial & linear system solver
- save calculation history
- radians and degrees angle modes
- pinch to zoom and drag for scrolling the graph in real time
- unlimited amout of equations added and plotted simultaneously
- customizable graph colors
- function tracing in cartesian
- graph view supports both portrait and landscape
- functions: sin, cos, tan, log10, ln, sinh, cosh, tanh, asin, acos, atan, asinh, acosh, atanh, ?, ³?, rand, abs, sgn, fac, sfac, round, fpart, ceil, floor
You can download it from the Windows Phone Store here.