### Home > PC > Chapter 6 > Lesson 6.1.4 > Problem6-56

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.

Use the hints provided in the question.

1. $2 \sin x − 1 = 0$

$x=\frac{\pi}{6}+2\pi n$

$x=\frac{5\pi}{6}+2\pi n$

$n$ is an integer

1. $2 + 2 \cos x = 0$

1. $\sqrt { 2 } − 2 \sin x = 0$

1. $\cos x + 3.8 = 0, [0, 2π]$