★★★ Top 2 paid app in marketplace of USA!!! ★★★
☆☆☆ Fully support WP8 and all resolution!!! ☆☆☆
★★★ The ONLY app supports implicit plot!!! ★★★

update in v1.5.5
support 720P & 1080P

update in v1.5.4
add Metro style Tile icon, you can switch the style in "equations" - "settings"

update in v1.5.3
1. fix display bug of equation solver

update in v1.5.2
1. move button '.' to right of button '0'
2. minor bug fix

update in v1.5.1
1. fix the polynomial solver bug
2. change sound effect default OFF

what's new in v1.5
1. add feature of polynomial solver
2. add feature of linear system solver
3. add sound effect
4. make it easy to input negative number in settings
5. change the tile icon
6. support alipay directly(支持支付宝直接付款)

new features will be added in v1.6
1. support extremum & zero point view in plot page
2. support view intersection point of functions

Features:
- includes a powerful and easy to use scientific calculator
- save calculation history
- radians and degrees angle modes
- cartesian, polar and parametric functions
- polynomial & linear system solver
- support pinch to zoom and drag for scrolling the graph in real time
- unlimited amout of equations can be added and plotted simultaneously
- customizable graph colors
- function tracing in cartesian
- graph view supports both portrait and landscape device orientation
- 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
Feel free to contact me if you have any question.