Write the following complex numbers in rectangular form and sketch their representation in Argand diagrams: 4 cis 120°

Please help me find the rectangular form as well as to sketch the argand diagram
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1 Answer

4cis(120)=4cos120+4isin(120)=-2+2i√3. Rectangular coordinate point (-2,2√3). Argand diagram shows length to be 4.

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