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31 Multiply and express your result in algebraic form a bi 4 cos 85 i...

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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 i sin 50 A 10 2 10 2 B 20 2 201 2 C 20 2 201 2 D 10 2 10i 2

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