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12-29.

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

  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.

    Unit Circle, with radius, drawn to a point on the circle, in first quadrant, labeled, pi sixths, & a radius, drawn to a point on the circle, in second quadrant, labeled, 5 pi sixths.

  2. In what quadrants is cos negative?

    Unit Circle, with radius, drawn to a point on the circle, in third quadrant, labeled, 5 pi sixths, & a radius, drawn to a point on the circle, in third quadrant, labeled, 7 pi sixths.

  3. When does ?

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