HP 15c - Manual (Page 31)

Section 2: Numeric Functions 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 Display
|D
Set to Degrees mode (no annunciator).
5
v 5.0000 y-value.
10 10 x-value.
|: 11.1803 r.
® 26.5651 θ; rectangular coordinates converted to
polar coordinates.
30
v 30.0000 θ.
12 12 r.
´; 10.3923 x-value.
® 6.0000 y-value. Polar coordinates converted to
rectangular coordinates.