HP 48gII - Manual (Page 788)

Page B-7
The e x key calculates the exponential function of x.
The x 2 key calculates the square of x (this is referred to as the SQ
function).
The ASIN, ACOS, and ATAN functions calculate the arcsine,
arccosine, and arctangent functions, respectively.
The 10 x function calculates the anti-logarithm of x.
The keys ≠, ≤, and ≥, are used for comparing real numbers.
The ABS function calculates the absolute value of a real number, or
the magnitude of a complex number or of a vector.
The USER function activates the user-defined keyboard menu.
The S.SLV function activates the symbolic solver menu.
The EXP&LN function activates the menu for substituting expressions in
terms of the exponential and natural logarithm functions.
The FINANCE function activates a menu for financial calculations.
The CALC function activates a menu of calculus functions.
The MATRICES function activates a menu for creating and
manipulation of matrices.
The CONVERT function activates a menu for conversion of units and
other expressions.
The ARITH function activates a menu of arithmetic functions.
The DEF key is used to define a simple function as a variable in the
calculator menu.
The CONT key is used to continue a calculator operation.
The ANS key recalls the last result when the calculator is in Algebraic
operation mode.
The [ ], ( ), and { } keys are used to enter brackets, parentheses, or
braces.
The # key is used to enter numbers in other than the active number
base.
The infinity key ∞ is used to enter the infinite symbol in an expression.
The pi key π is used to enter the value or symbol for π (the ratio of the
length of a circumference to its diameter).
The arrow keys, when combined with the left-shift key, move the
cursor to the first character in the direction of the key pressed.