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anonymous
 one year ago
Express the complex number in trigonometric form.
3i
anonymous
 one year ago
Express the complex number in trigonometric form. 3i

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jdoe0001
 one year ago
Best ResponseYou've already chosen the best response.1\(3i\implies \begin{array}{ccllll} 0&3i\\ \uparrow &\uparrow \\ x&y \end{array}\qquad \begin{cases} r=\sqrt{x^2+y^2}\\ \theta=tan^{1}\left( \frac{y}{x}\right) \end{cases}\qquad 03i\implies r[cos(\theta)+i\ sin(\theta)]\) notice your "x" notice your "y" can you plot them both here ?dw:1440717978056:dw

jdoe0001
 one year ago
Best ResponseYou've already chosen the best response.1by plotting them, you can get the angle easy, rather than getting the tangent, which in this case will be undefined anyway

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@jdoe0001 so would it be 3(cos 0° + i sin 0°)

jdoe0001
 one year ago
Best ResponseYou've already chosen the best response.1well... what's your "r"? what's your \(\theta?\)
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