beautypg.com

Problems – HP 15c User Manual

Page 135

background image

Section 11: Calculating With Complex Numbers 135

Example: Find the sum 2(cos 65° + i sin 65°) + 3(cos 40° + i sin 40°) and
express the result in polar form, (In phasor form, evaluate 2

65° +

3

40°.)

Keystrokes

Display

| D

Sets Degrees mode for any polar-
rectangular conversions.

2

v

2.0000

65

´ V

2.0000

C annunciator displayed;
Complex mode activated.

´ ;

0.8452

Converts polar to rectangular
form; real part (a) displayed.

3

v

3.0000

40

´ V

3.0000

´ ;

2.2981

Converts polar to rectangular
form; real part (a) displayed.

+

3.1434

| :

4.8863

Converts rectangular to polar
form; r displayed.

´% (hold)

49.9612

θ (in degrees).

(release)

4.8863

Problems

By working through the following problems, you will see that calculating
with complex numbers on the HP-15C is as easy as calculating with real
numbers. In fact, once your numbers are entered, most mathematical
operations will use exactly the same keystrokes. Try it and see!

1. Evaluate:

)

5

4

(2

)

5

2

(4

3

)

6

8

(

2

i

i

i

i