6) a. sin225 has a reference angle of 45 degrees in Quadrant III. Therefore the ratio is
- √2 / 2
b. tan11π /6 has a reference angle of π/6 in Quadrant IV. Therefore the ratio is:
-√3 / 3
7) If sinθ = 3/7 and tanθ <0 then we are in Quadrant II
a. cosθ = -2√10 / 7
b. tanθ = 3 / -2√10 = - 3√10 / 20
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