Precalculus Examples

$- \frac{5}{2} \cdot \cos (\frac{3}{4} \cdot (\frac{π}{4}))$

Step 1

Multiply $\frac{3}{4} (\frac{π}{4})$ .

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Step 1.1

Multiply $\frac{3}{4}$ by $\frac{π}{4}$ .

$- \frac{5}{2} \cdot \cos (\frac{3 π}{4 \cdot 4})$

Step 1.2

Multiply $4$ by $4$ .

$- \frac{5}{2} \cdot \cos (\frac{3 π}{16})$

Step 2

Combine $\cos (\frac{3 π}{16})$ and $\frac{5}{2}$ .

$- \frac{\cos (\frac{3 π}{16}) \cdot 5}{2}$

Step 3

Move $5$ to the left of $\cos (\frac{3 π}{16})$ .

$- \frac{5 \cos (\frac{3 π}{16})}{2}$

Step 4

The result can be shown in multiple forms.

Exact Form:

$- \frac{5 \cos (\frac{3 π}{16})}{2}$

Decimal Form:

$- 2.07867403 \dots$