From Gabor Nagy:
Graphing Calculator turns your phone or iPod into an intuitive high-resolution function plotter and scientific calculator. Features include the following: Includes a powerful, yet easy to use scientific calculator. Quickly plot and trace multiple equations on the same graph. Custom keyboard to speed up entering in equations. Pinch to zoom and drag/slide for scrolling the graph in real time. The graph view supports portrait and landscape modes. Take screen shots, and e-mail graphs to yourself. Evaluate your graphs at any x value using the calculator screen. Find the exact (x,y) coordinates for roots, intersections, minimums and maximums using the trace mode. Provides conditional statements allow the user to restrict the domain and graph piece-wise functions.- Supports graphing polar and parametric equations. Supports graphing inequalities, and implicit equations in the form f(x,y)=g(x,y). Retina display and multitasking support- Display the graph on a TV, projector, or external monitor using Apple's VGA adapter (iPhone 4S, iPhone 4, 4th gen iPod, and iPad only). Currently supports the following functions: abs, acos, acosh, acot, acoth, acsc, acsch, asec, asech, asin, asinh, atan, atan2, atanh, ceil, cos, cosh, cot, coth, csc, csch, deg2rad, exp, fact, floor, gamma, gcd, lcm, lgamma, ln, log2, log10, logbase, max, min, mod, nCr, nPr, nroot, rad2deg, rand, sec, sech, sin, sinh, sqrt, tan, tanh.Please visit the website for more details and screen shots.