# Natural Logarithms And Exponential Function; Trigonometric Functions; Inverse Trigonometric Functions - HP F2226A - 48GII Graphic Calculator User Manual

Graphing calculator.

Or, in RPN mode:

## Natural logarithms and exponential function

Natural logarithms (i.e., logarithms of base e = 2.7182818282) are
calculated by the keystroke combination ‚¹ (function LN) while its
inverse function, the exponential function (function EXP) is calculated by using
„¸. In ALG mode, the function is entered before the argument:
In RPN mode, the argument is entered before the function

### Trigonometric functions

Three trigonometric functions are readily available in the keyboard: sine
(S), cosine (T), and tangent (U). The arguments of these functions are
angles, therefore, they can be entered in any system of angular measure
can calculate the following trigonometric functions:
In ALG mode:
In RPN mode:

### Inverse trigonometric functions

The inverse trigonometric functions available in the keyboard are the arcsine
(ASIN), arccosine (ACOS), and arctangent (ATAN), available through the
keystroke combinations „¼, „¾, and „À, respectively.
Since the inverse trigonometric functions represent angles, the answer from
these functions will be given in the selected angular measure (DEG, RAD,
GRD). Some examples are shown next:
In ALG mode:
4.5\V2\`
‚¹2.45`
„¸\2.3`
2.45` ‚¹
2.3\` „¸
S30`
T45`
U135`
30`S
45`T
135`U
„¼0.25`
„¾0.85`
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