Apple iPhone/iPhone 3G (User manual) - Manual (Page 95)

Chapter 7 More Applications 95
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 e x to
2 x . 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.
x 2 Squares a value.
x 3 Cubes a value.
y x Tap between values to raise the first value to the power of the second value. For
example, to compute 3
4 , enter
3 y x 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.
log Returns the log base 10 of a value.
sin Calculates the sine of a value.
sin -1 Calculates the arc sine of a value. (Available when the 2nd button is tapped.)
cos Calculates the cosine of a value.
cos -1 Calculates the arc cosine of a value. (Available when the 2nd button is tapped.)
tan Calculates the tangent of a value.
tan -1 Calculates the arc tangent of a value. (Available when the 2nd button is tapped.)
ln Calculates the natural log of a value.
log2 Calculates the log base 2. (Available when the 2nd button is tapped.)
sinh Calculates the hyperbolic sine of a value.
sinh -1 Calculates the inverse hyperbolic sine of a value. (Available when the 2nd button is
tapped.)