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4 years ago

I give brain thingy if u help me out :D

Mathematics

1 answer:

Marat540 [252]4 years ago

3 0

Answer: (-2, 0)

Step-by-step explanation:

Because it is the only one that lies along the line of (-2, -3)

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Express the complex number in trigonometric form. <br><br> -4i

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Answer:

-4i = 4(cos 270 +i sin 270)

Step-by-step explanation:

We have a+ib = r(cosθ+isinθ)

$r=\sqrt{a^2+b^2}\texttt{ and }tan\theta =\frac{b}{a}$

Here a = 0 and b = -4

Substituting

$r=\sqrt{0^2+(-4)^2}\\\\r=4\\\\tan\theta =\frac{-4}{0}\\\\\theta =270^0\texttt{(Since a is zero and b is negative)}$

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