A calculator with 29-functions for basic arithmetic, algebra, trigonometry and discrete math.… A calculator with 29-functions for basic arithmetic, algebra, trigonometry and discrete math. Keyboard Shortcuts: a - All Clear (AC) c - All Clear (AC) e - e n - negate (+/-) p - Pi (π) % - % i - inverse (1/x) ^ - yⁿ ! - ! @ - x²