asd123456 asd123456

21-06-2017
Mathematics

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Express the complex number in trigonometric form.

-4i

My answer = 4(cos 180° + i sin 180°)

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catgirl564 catgirl564

21-06-2017

cos 180 = -1
sin 180 = 0

So you put in the answer that when you revert it into complex again, it would be -4.

The correct answer would be 4(cos 270 + i sin 270)

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