(solution) Assignment: Correcting Complex Number Polar Form Part 1 -

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Assignment: Correcting Complex Number Polar Form

Part 1 ? Who?s Right?

Each of the following problems has been answered by two students, Ying and Jabbar. In each

case, one of the student?s answers are correct, and the other student?s answers are incorrect.

For each question:

a. State which student?s response is correct.

b. Find, clearly identify, and correct the misconceptions in the incorrect student?s response.

c. Write 2-3 sentences describing the incorrect student?s mistakes and how it should be

corrected. 1. Express 3 i in polar form. Express all trigonometric values exactly. Ying Jabbar z 3 i

r 3 z 3 i

2 12 3 1 4 2 3 1 arctan 3 6 3 r 3 2 12 3 1 4 2 3 1 arctan 3 6 3 arctan arctan z 2 cos i sin 6

6 z 2 sin i cos 6

6 © K12 Inc. 2. Express 5 cos i sin in rectangular form. Express all trigonometric values exactly.

2

2 Ying Jabbar z 5 cos i sin 2

2 z 5 1 0i z 5 cos i sin 2

2 z 5 0 1i z 5 z 5i 3. Find the following product: 5 cos i sin 2 cos i sin .

3

3 6

Ying Jabbar 5 cos i sin 2 cos i sin 3

3 6

6 5 cos i sin 2 cos i sin 3

3 6

6 5 2 cos i sin 3 6 3 6 5 2 cos i sin 3 6 3 6 3 cos i sin 2

2 3 0 i 10 cos i sin 2

2 10 0 i 3i 10i © K12 Inc. 4. Find the quotient of the following expressions:

5

5 7 cos i sin 2 cos i sin .Express your final answer in rectangular form.

6

6 2

2 Ying Jabbar 5

5 7 cos i sin

6

6 2 cos 2 i sin 2 7 5 5 i sin cos 2 6 2 6 2 5

5 7 cos i sin

6

6 2 5 cos 7 2 6 2 cos i sin 2

2 5 i sin 2 6 7 cos i sin 2

3

3 7 cos i sin 2 3 3 71

3 i

2 2 2 71

3 i

2 2 2 7 7 3 i

4

4 7 7 3 i

4

4 Part 2 ? Common Mistakes

The problems above describe some of the most common mistakes made when first working with

the polar form of complex numbers.

Which of the mistakes described do you find the easiest to make? Write 4-5 sentences that

describe what you feel is the most common type of mistake made. In your response be sure to

include the following: Describe the mistake.

Explain why you find the mistake easiest to make.

What steps can you take to help you avoid these types of mistakes in the future? © K12 Inc.

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