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31. Multiply and express your result in algebraic form a + bi: 4 (cos 85 + i sin 85) x 5 (cos 50 +

31. Multiply and express your result in algebraic form a + bi: 4 (cos 85 + i sin 85) x 5 (cos 50 + i sin 50) A. 102-1012 B. -202+2012 C. 202-2012 D. -102+102

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