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 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.
x2Squares a value.
x3Cubes a value.
yxTap 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√yUse 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.)