fx-9860GII TI-83
►Rect
On a Casio calculator you can transform a complex number in polar form (r∠θ) to rectangular form (a+bi)
MATH ► ► 6
or via the catalog as
CATALOG ⎵ 2nd 0 ►Rect ENTER
Be sure to select the number mode setting re^θi.
Example 1
To transform the complex number √-2 to 1.414213562i
√ I 2nd x² (–) 2 √(-2
MATH ► ► 6 √(-2►Rect
ENTER √(-2►Rect 1.44213562i