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


Solve each equation for . No calculator should be necessary.

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


    Now convert the angles into radians.

  1. See part (a).

  1. If .

  1. Remember the side ratios of right triangles.

Compute without a calculator