
Mark M. answered 12/05/14
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Mathematics Teacher - NCLB Highly Qualified
cos-1 (-√3 / 2) is 5π/6 or 7π/6. (cos-1 √3 / 2 is π/6. The negative puts the angle in QII and QIII.)
tan 5π/6 = -√3 / 3
tan 7π/6 = √3 / 3
If a restriction was put on the range the number of solution would diminish.

Mark M.
Yes, if π/2 ≥ θ ≥ -π/2.
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12/05/14
Ashton W.
12/05/14