QuestionAugust 27, 2025

Perform the following operations on these complex numbers. 9(cos45^circ +isin45^circ )cdot 11(cos45^circ +isin45^circ ) [?](cossquare ^circ +isinsquare ^circ )

Perform the following operations on these complex numbers. 9(cos45^circ +isin45^circ )cdot 11(cos45^circ +isin45^circ ) [?](cossquare ^circ +isinsquare ^circ )
Perform the following operations
on these complex numbers.
9(cos45^circ +isin45^circ )cdot 11(cos45^circ +isin45^circ )
[?](cossquare ^circ +isinsquare ^circ )

Solution
4.3(259 votes)

Answer

99(\cos 90^\circ + i\sin 90^\circ) Explanation 1. Multiply the Magnitudes Multiply the magnitudes of the complex numbers: 9 \cdot 11 = 99. 2. Add the Angles Add the angles of the complex numbers: 45^\circ + 45^\circ = 90^\circ.

Explanation

1. Multiply the Magnitudes<br /> Multiply the magnitudes of the complex numbers: $9 \cdot 11 = 99$.<br />2. Add the Angles<br /> Add the angles of the complex numbers: $45^\circ + 45^\circ = 90^\circ$.
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