The best Graphing Calculator I have used in WP7

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http://forum.xda-developers.com – I've found a nice graphing calculator in marketplace, it is the best I've used in WP7 platform. You can download it from : Grapher Calculator | Windows Phone Apps+Games Store (United States) Here is its intruction: Grapher Calculator is a powerful function plotter and scientific calculator. What's new in v1.02: ★ save calculation history ★ fix the bug in trail version that can't link to the full version Features: - includes a powerful and easy to use scientific calculator - save calculation history - radians and degrees angle modes - cartesian, polar and parametri (HowTos)