### Home > INT3 > Chapter 11 > Lesson 11.2.4 > Problem 11-104

11-104.

Solve each equation for 0 ≤

*x*< 2*π*. No calculator should be necessary. Homework Help ✎cos( *x*) = –tan(

*x*) =sin(

*x*) = 0cos(

*x*) =

In which quadrants is cosine negative? Sketch a unit circle with right triangles with 30° angles at the origin in the second and third quadrants. What are the circular angles?

*x* = 120° and 240°

Now convert the angles into radians.

See part (a).

If sin(*x*) = 0, *x* = 0.

*x* = 0

Remember the side ratios of 45° right triangles.