### Home > CCA2 > Chapter Ch12 > Lesson 12.1.2 > Problem 12-29

12-29.

For each of the following equations, find the solutions that lie in the domain

. For the equation to be true,

must . You can either draw a unit circle to find all possible solutions or solve the equation graphically.

In what quadrants is cos

negative? When does

? Picture a unit circle. At what angle is the adjacent side the same length as the hypotenuse?