HP 15c Collector's Edition Owner's Handbook Manual page 142

130 Section 11: Calculating With Complex Numbers
X-registers
Storing and Recalling Complex Numbers
O l
a ib
Operations With Complex Numbers
result is also real
HP 15c Advanced Functions Handbook
´ }
not
O 1 ´ }
´ }
a
l 1 l 2
l 2 ´ }
| `
: ;
real X-register only
O 2
ib
´ V
− l 1
−
real numbers
assuming the
n n