Precalculus Examples

$3 \cos (\frac{5 π}{3})$

Step 1

Find the value using the definition of cosine.

$\cos (\frac{5 π}{3}) = \frac{adjacent}{hypotenuse}$

Step 2

Substitute the values into the definition.

$\cos (\frac{5 π}{3}) = \frac{\frac{1}{2}}{1}$

Step 3

Divide $\frac{1}{2}$ by $1$ .

$\frac{1}{2}$

Step 4