Write the complex number in polar form. Express the argument ? in degrees, with 0 ? ? ? 360°.9 + 9i

A. 9(cos 225° + i sin 225°)
B. 9(cos 45° + i sin 45°)
C. 9(cos 315° + i sin 315°)
D. 9(cos 135° + i sin 135°)

Answer: B

Mathematics

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