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Pre-Calculus Complex numbers (advanced)

Operations on complex numbers in polar form

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Questions
Question 1
186943
Let \(z_1=3(\cos 40^\circ+i\sin 40^\circ)\) and \(z_2=5(\cos 20^\circ+i\sin 20^\circ)\). Find \(z_1z_2\) in polar form.
\(15(\cos 60^\circ+i\sin 60^\circ)\)

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