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A complex number is written as $ a + b\,i $ where $ a $ and $ b $ are real numbers an $ i $, called the imaginary unit, has the property that $ i^2 = 1 $.
The complex numbers $ z = a + b\,i $ and $ \overline{z} = a  b\,i $ are called complex conjugate of each other.
Equality of complex numbers

$$ a + b\,i = c + d\,i \Longleftrightarrow a = c ~~and~~ b = d $$ 
Addition of complex numbers

$$ (a + b\,i) + (c + d\,i) = (a + c) + (b + d)\,i $$ 
Subtraction of complex numbers

$$ (a + b\,i)  (c + d\,i) = (a  c) + (b  d)\,i $$ 
Multiplication of complex numbers

$$ (a + b\,i)\cdot(c + d\,i) = (ac  bd) + (ad + bc)\,i $$ 
Division of complex numbers

$$ \frac{a + b\,i}{c + d\,i} = \frac{a + b\,i}{c + d\,i}\cdot\frac{c  d\,i}{c  d\,i} = \frac{ac + bd}{c^2 + d^2} + \frac{bc  ad}{c^2 + d^2} \, i$$ 
Polar form of complex numbers

$$ a + b\,i = r\cdot(\cos\theta + i\,\sin\theta) $$ 
Multiplication and division of complex numbers in polar form

$$\left[r_1\left(\cos\theta_1 + i \cdot \sin\theta_1\right)\right] \cdot \left[r_2\left(\cos\theta_2 + i \cdot \sin\theta_2\right)\right] = r_1 \cdot r_2 \left[ \cos\left(\theta_1+\theta_2\right) + i \cdot \sin\left(\theta_1+\theta_2\right) \right]$$ 

$$\frac{r_1\left(\cos\theta_1 + i\,\sin\theta_1\right)}{r_2\left(\cos\theta_2 + i\,\sin\theta_2\right)}= \frac{r_1}{r_2} \left[\cos\left(\theta_1\theta_2\right) + i \cdot \sin\left(\theta_1\theta_2\right)\right]$$ 
De Moivre's theorem

$$ \left[r \left( \cos\theta + i\,\sin\theta \right) \right]^n = r^n \left( \cos ( n\theta) + i\,\sin (n\theta) \right)$$ 
Roots of complex numbers

$$ \left[r \left( \cos\theta + i\,\sin\theta \right) \right]^{1/n} = r^{1/n} \left( \cos \frac{\theta + 2k\pi}{n} + i\,\sin \frac{\theta + 2k\pi}{n} \right) ~~ k=0,1,\dots, n1 $$ 
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