HP -15C Owner's Handbook Manual page 31

Rectangular Conversion. Pressing ´; (rectangular) converts a set of
polar coordinates (magnitude r angle θ) into rectangular coordinates (x, y). θ
must be entered first then r. Upon executing ´;, x will be displayed
first; press ® to display y.
Keystrokes
|D
5 v
10
|:
®
30 v
12
´;
®
Display
5.0000
10
11.1803
26.5651
30.0000
12
10.3923
6.0000
Section 2: Numeric Functions
Set to Degrees mode (no annunciator).
y-value.
x-value.
r.
θ; rectangular coordinates converted to
polar coordinates.
θ.
r.
x-value.
y-value. Polar coordinates converted to
rectangular coordinates.
31