HP HP-20S - Page 98

Example 2: Calculate the magnitude of (3 + 61)%.
Keys: Display: Description:
3 6 F 6.0000 Enters complex
number.
2 36.0000 Enters power and cal-
culates. Displays
imaginary part.
9 45.0000 Calculates magnitude.
Example 3: Evaluate the expression: B
Z, + 24
where z; = 23 + 13i, zp = —2 + i, and z3 = 4 — 3i. Since the
program does not allow for parentheses, perform the calculation as
zy X [1/ (z2 + z3)]:
Keys: Display: Description:
2 1 A 1.0000 Enters z,, complex add.
4 3 —2.0000 Enters z3; calculates
Z; + zj3.
E 0.2500 Calculates 1/(z, + z3).
C 0.2500 Complex multiply.
23 13 9.0000 Displays imaginary
part of z1/(z, + z3).
(«] 2.5000 Displays real part of
21/(zy + z3).
Remarks:
The complex power can only be calculated for an integer exponent.
The message Error - Func appears if a noninteger exponent is used.
The same error message will appear if the magnitude of the complex
number in the denominator is zero when dividing or taking the
reciprocal.
If there is a pending expression when complex numbers are entered, it
is evaluated before the numbers are used for complex operations.
96 7: Built-in Program Library