Trigonometry Examples

$8 \cos (2 x) + 7 \cos (2 x) - 1 = 0$

Step 1

Add $8 \cos (2 x)$ and $7 \cos (2 x)$ .

$15 \cos (2 x) - 1 = 0$

Step 2

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

$x \approx 0.75204008 + π n, 2.38955256 + π n$ , for any integer $n$

Step 3