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Sphinxa [80]
2 years ago
13

How many eighths are in 1/3?

Mathematics
1 answer:
Anon25 [30]2 years ago
8 0

Answer:

1/3 = 2 2/3 eighths.

Step-by-step explanation:

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15

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Write -3+4i in the form r(cosx+isinx)
Zanzabum
-3+4i is a complex number that satisfies

\begin{cases}r\cos x=-3\\[1ex]r\sin x=4\\[1ex]r=\sqrt{(-3)^2+4^2}\end{cases}

The last equation immediately tells you that r=5.

So you have

\begin{cases}\cos x=-\dfrac35\\[1ex]\sin x=\dfrac45\end{cases}

Dividing the second equation by the first, you end up with

\dfrac{\sin x}{\cos x}=\tan x=\dfrac{\dfrac45}{-\dfrac35}=-\dfrac43

Because the argument's cosine is negative and its sine is positive, you know that \dfrac\pi2. This is important to know because it's only the case that y=\tan x\implies \arctan y=x whenever -\dfrac\pi2. The inverse doesn't exist otherwise.

However, you can restrict the domain of the tangent function so that an inverse can be defined. By shifting the argument of tangent by \pi, we have

\tan(x-\pi)=y\implies x=\pi+\arctan y

All this to say

\tan x=-\dfrac43\implies x=\pi+\arctan\left(-\dfrac43\right)\approx2.2143\text{ rad}\approx126.9^\circ

So, -3+4i=5(\cos126.9^\circ+i\sin126.9^\circ).
5 0
3 years ago
I don’t understand this. Can you please help me? thank you.
il63 [147K]

Answer:

Step-by-step explanation:

Sfbwertb

4 0
2 years ago
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