Differentiation

This app is for learning, practicing and touching differentiation to find points of extreme on cubic equation.You can also learn differentiation on Web, for example,differentiation wikipediahttp://en.wikipedia.org/wiki/Differentiation_(mathematics)cubic functionhttp://en.wikipedia.org/wiki/Cubic_functionThis free program can be solved only by the following technique. y=ax^3 + bx^2 + cx + dy'= 3ax^2 + 2bx + cAfter starting this app, the screen changes every three second to draw alternative question. Once touch the screen, the question begins.