Trigonometry Examples

$y = \cos (x + \frac{π}{2})$

Step 1

Rewrite the equation as $\cos (x + \frac{π}{2}) = y$ .

$\cos (x + \frac{π}{2}) = y$

Step 2

Take the inverse cosine of both sides of the equation to extract $x$ from inside the cosine.

$x + \frac{π}{2} = \arccos (y)$

Step 3

Subtract $\frac{π}{2}$ from both sides of the equation.

$x = \arccos (y) - \frac{π}{2}$