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12-29.
  1. For each of the following equations, find the solutions that lie in the domain 0 ≤ x < 2π. Homework Help ✎

    1. 2 sin (x) − 1 = 0

    2. 2 cos (x) = −

    3. 2 sin(x) =

    4. cos(x) = 1

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

In what quadrants is cos(x) negative?

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