Precalculus Examples

$\cos (\frac{π}{2} + x) = - \sin (x)$

Step 1

Graph each side of the equation. The solution is the x-value of the point of intersection.

$x \approx - 0.1, \frac{1}{5}, - \frac{2}{5}, - \frac{1}{2}, \frac{1}{2}, \frac{3}{5}, 0.7$

Step 2

The result can be shown in multiple forms.

Exact Form:

$x \approx - 0.1, \frac{1}{5}, - \frac{2}{5}, - \frac{1}{2}, \frac{1}{2}, \frac{3}{5}, 0.7$

Decimal Form:

$x \approx - 0.1, 0.2, - 0.4, - 0.5, 0.5, 0.6, 0.7$

Step 3