Addition and Subtraction

Rarely Tested

Addition and Subtraction

## Formula

If:

$$z_1=a+ib,\qquad z_2=c+id$$

then:

$$z_1+z_2=(a+c)+i(b+d)$$

$$z_1-z_2=(a-c)+i(b-d)$$

## Conditions / Special Cases

Real parts are added or subtracted separately, and imaginary parts are added or subtracted separately.

## Usage

- Used for basic algebraic operations on complex numbers.

Question 1

Let $$z = 1 + i$$. Define a new complex number $$z_1$$ as follows:

$$z_1 = \frac{1 + i\bar{z}}{\bar{z}(1 - z) + \frac{1}{z}}$$

Then the value of $$\frac{12}{\pi} \arg(z_1)$$ is equal to:

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