3b) Sin (7п/6)=1/2 3g) tan (-17п/6)=-sqrt(3)/3 3h) tan (-33п/4)=-1 4. If cos (x)=-.25, then on a unit circle, the hypotenuse would have to be one. Using Pythagorean's Theorem, one can conclude that the measure opposite the angle is sqrt15/4. sin x=sqrt(15)/4 cos x=-.25 tan x=-sqrt(15) 6a and b) sin...