Multiplication, Division

1
Multiplication, Division DeMoivres Theorem

• ES Making decisions after reflection and review
• Warm-Up Convert -8 8i into trigonometric form.

2
Multiplying in Trig (cis) Form
3
Dividing in Trig (cis) Form
4
Examples Evaluate with the help of trig form if
needed. Show your answer in both trig standard
form.

• (3 3i)(-2 2i)

5
Examples Evaluate.

• 2) (3cis90)(5cis45)

6
Examples Evaluate with the help of trig form if
needed. Show your answer in both trig standard
form.

• 3)

7
Examples Evaluate

• 4)

8
DeMoivres Theorem
9
Examples Evaluate

• 5) 4(1 - iv3)3

10

• Evaluate. Leave your answer in trig form with
  the argument in the interval

11
Closure Evaluate, putting your final answer in
standard form. Check your answer on your
calculator