Pre calculus question

label Mathematics
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Express the complex number in trigonometric form. (1 point)

-3i

3(cos 180° + i sin 180°)
3(cos 270° + i sin 270°)
3(cos 90° + i sin 90°)
3(cos 0° + i sin 0°)
Feb 26th, 2015

Answer 3 (cos 270 + i sin 270)

r (cos theta + i sin theta) with  r positive and angle between 0 and 360 degrees

Feb 26th, 2015

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Feb 26th, 2015
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Feb 26th, 2015
Oct 23rd, 2017
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