Trigonometry Examples

$\sin (- 90)$

Find the value using the definition of sine.

$\sin (- 90) = \frac{opposite}{hypotenuse}$

Substitute the values into the definition.

$\sin (- 90) = \frac{- 1}{1}$

Divide $- 1$ by $1$ .

$- 1$

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