App: Good Grapher - scientific graphing calculator
Developer: Iurii Mozharovskyi
Genres: Bildung, Dienst­programme

Good Grapher™ - great and very powerful scientific graphing calculator. It will become your reliable assistant from elementary school to university and work.

SCIENTIFIC CALCULATOR: 
- History tape 
- real and complex numbers 
- radians and degrees angle modes, support for minutes, seconds, grads 
- constants: astronomical, atomic, electromagnetic, mathematical, physicochemical, universal 
- functions: sin, cos, tan, cot, sec, csc, sinh, cosh, tanh, coth, asin, acos, asec, acsc, atan, acot, asinh, acosh, atanh, acoth, log2, log10, ln, logn(n,x) (log x with base n), √, ³√, abs, avg, ceil, floor, round, deg2rad, rad2deg, max, min, sgn, lcm, gcd, nCr, nPr, arg, real, imag, conj, polar 
- operators: +, -, *, /, % (modulus), ^, ! (factorial), ' (minutes), " (seconds), {grad} 
- assignment operator and A, B,…,J variables for values storage 

2D GRAPHING CALCULATOR: 
- carefully-designed graph visualization 
- cartesian y(x) and x(y), polar r(θ), parametric x(t) y(t), implicit graphs 
- inequalities drawing 
- function tracing and automatic min/max, zeros, intersections scanning for all function types 
- intersection discovering between different function types, e.g. between cartesian y=x and polar r=1 
- unlimited number of functions can be drawn simultaneously 
- standard, trigonometric and logarithmic axes 
- proportional and non-proportional scaling 
- customizable graph colors 
- table of graph values 
- make screenshot 

3D GRAPHING CALCULATOR: 
- cartesian x(y,z), y(x,z), z(x,y), cylindrical x(p,φ), y(p,φ), z(p,φ), spherical r(θ,φ), parametric xyz(u,v) and implicit graphs 
- inequalities drawing 
- points, lines, surface drawing modes 
- configurable graph bounds 
- make screenshot 

MATH SOLVER: 
- polynomial solver: 
2x - 3 = 0 (linear) 
3x² + 4x + 8 = 0 (quadratic) 
5x³ + 2x² - 4x + 2 = 0 (cubic) 
7x⁴ - 2x³ + 3x² + 2x - 1 = 0 (quartic) 
- system of linear equations solver 
with 2 unknown 
2x - 9 = 9 
3x + 4y = -13 
with 3 unknown 
-5x + 4y + 2z = -4 
7x + 2y + 3z = 19 
3x + 5y - 1z = 10 

iOS
Good Grapher is also available for iPhone, iPod and iPad!
See www.goodgrapher.com

Visit www.goodgrapher.com for more screenshots, demo videos, details and news. Feel free to contact us for any questions and suggestions.

Release notes:
- minor bug fixes and improvements