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Exercises 12.4, page 356

1. $5 (\cos 126.9 ° + j \sin 126.9 °)$
3. $10 (\cos 36.9 ° + j \sin 36.9 °)$
5. $50 (\cos 306.9 ° + j \sin 306.9 °)$
7. $3.61 (\cos 123.7 ° + j \sin 123.7 °)$
9. $0.60 (\cos 204 ° + j \sin 204 °)$
11. $2 (\cos 60 ° + j \sin 60 °)$

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