Trigonometry Examples

$\sin (- \frac{5 π}{4})$

Step 1

Find the value using the definition of sine.

$\sin (- \frac{5 π}{4}) = \frac{opposite}{hypotenuse}$

Step 2

Substitute the values into the definition.

$\sin (- \frac{5 π}{4}) = \frac{\frac{\sqrt{2}}{2}}{1}$

Step 3

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

$\frac{\sqrt{2}}{2}$

Step 4

The result can be shown in multiple forms.

Exact Form:

$\frac{\sqrt{2}}{2}$

Decimal Form:

$0.70710678 \dots$

Step 5