Write the complex number in trigonometric form r(cos ? + i sin ?), with ? in the interval [0°, 360°).-9 + 12i
A. 15(cos 53.1° + i sin 53.1°)
B. 15(cos 233.1° + i sin 233.1°)
C. 15(cos 306.9° + i sin 306.9°)
D. 15(cos 126.9° + i sin 126.9°)
Answer: D
Mathematics
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?
?
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.
A. 7, 
, 
, 
, 
B. 7, 
, 8, 
, 9
C. 
, 
, 
, 
, 
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