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Home > A2C > Chapter 13 > Lesson 13.1.2 > Problem 13-31


For each of the following equations, find the solutions that lie in the domain . Homework Help ✎

  1. For the equation to be true,  must .

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

  2. In what quadrants is cos negative?

  3. When does ?

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