HP 49g Graphing Calculator - Manual (Page 69)

The trigonometric operations SIN, COS, and TAN, operate only on unit
objects with-planar ang-ular units: radians (r), degrees (°), grads (grad),
arc-minutes (arcmin), or arc-seconds (arcs).
Temperature units require special attention: see “Working with
temperatiue imits” on page 6-8.
Sample unit calculations
The following examples assume that you are working in algebraic mode.
Subtraction. To subtract 39 in from 4 ft:
1. Enter 4_ft.
2. Press Q.
3. Enter 39Jn.
4. Press (ENTER).
The answer is 9„in. Note that the answer takes the imits of the last
entered unit object. If you had subtracted 4ft from 39in, the answer
would be in feet.
In RPN mode: follow steps 1, 3, and 2.
Unit multiplication and division. To multiply 50 ft by 45ft and divide
the result by 3 days:
1. Enter (50_ft).
Note that when you are in algebraic mode and multiplying or dividing
unit objects, or raising a imit object to a power, the miit object must be
entered in parentheses. (The one exception is the last imit object you
specify.)
2. Press ®-
3. Enter (45_ft).
4. Press ©.
5. Enter 3_d.
Note that the last unit object does not need to be entered in
parentheses.
6. Press (ENTlff).
The answer is 750_ft2/d.
In RPN mode: follow steps 1, 3, 2, 5, and 4. Parentheses are not required
aroimd unit objects in RPN mode.
Page 6-6 Unit objects