Engineering Board Exam Reviewer · Complex Numbers: Polar and Exponential Form · medium

Multiply using polar form: (2, cis,30°)(3, cis,60°)

1. 6, cis,90°
2. 6, cis,30°
3. 5, cis,90°
4. 6, cis,1800°

Answer

A. 6, cis,90°

Solution

Multiply the magnitudes and add the angles: 2(3), cis(30°+60°)=6, cis,90°.

More Complex Numbers: Polar and Exponential Form questions

1. Divide using polar form: 12, cis,80°4, cis,20°
2. Use De Moivre's Theorem to find (2, cis,30°)3.
3. Write 4+4i in polar form.
4. Convert 10 60° to rectangular form.
5. Find the polar form of -3+3i.

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