CPM Homework Help : PC Problem 6-56

Solve for $x$ on the indicated domain. Begin by solving for the function. Recall that if no domain is indicated, the domain is all real numbers. Remember to use either a unit circle or wave graph as a visual reminder.

Hint:

Use the hints provided in the question.

$2 \sin x − 1 = 0$
Answer (a):
$x=\frac{\pi}{6}+2\pi n$
$x=\frac{5\pi}{6}+2\pi n$
$n$ is an integer

$2 + 2 \cos x = 0$

$\sqrt { 2 } − 2 \sin x = 0$

$\cos x + 3.8 = 0, [0, 2π]$