Precalculus Examples

$z = 4 (\cos (90) + i \sin (90))$

Step 1

Simplify each term.

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Step 1.1

The exact value of $\cos (90)$ is $0$ .

$z = 4 (0 + i \sin (90))$

Step 1.2

The exact value of $\sin (90)$ is $1$ .

$z = 4 (0 + i \cdot 1)$

Step 1.3

Multiply $i$ by $1$ .

$z = 4 (0 + i)$

$z = 4 (0 + i)$

Step 2

Add $0$ and $i$ .

$z = 4 i$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$