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

11-104.
  1. Solve each equation for 0 ≤ x < 2π. No calculator should be necessary. Homework Help ✎

    1. cos(x) = –

    2. tan(x) =

    3. sin(x) = 0

    4. cos(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.