Apple iPod Touch User Guide - Page 113

Scientific Calculator Keys Rotate iPod touch to landscape orientation to display the scientific calculator. 2nd Changes the trigonometric buttons (sin, cos, tan, sinh, cosh, and tanh) to their inverse functions (sin-1, cos-1, tan-1, sinh-1, cosh-1, and tanh-1). It also changes ln to log2, and ex to 2x. Tap 2nd again to return the buttons to their original functions. ( Opens a parenthetical expression. Expressions can be nested. ) Closes a parenthetical expression. % Calculates percentages, adds markups, and subtracts discounts. To calculate a percentage, use it with the multiplication (x) key. For example, to calculate 8% of 500, enter 500 x 8 % = which returns 40. To add a markup or subtract a discount, use it with the plus (+) or minus (-) key. For example, to compute the total cost of a $500 item with an 8% sales tax, enter 500 + 8 % = which returns 540. 1/x Returns the reciprocal of a value in decimal format. x2 Squares a value. x3 Cubes a value. yx Tap between values to raise the first value to the power of the second value. For example, to compute 34, enter 3 yx 4 = which returns 81. x! Calculates the factorial of a value. √ Calculates the square root of a value. x√y Use between values to calculate the x root of y. For example to compute 4√81, enter 81 x√y 4 = which returns 3. Chapter 17 Calculator 113