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10 questions from this quiz
30°30°30°, 45°45°45°, 60°60°60°
1:3:21 : \sqrt{3} : 21:3:2
1:1:21 : 1 : \sqrt{2}1:1:2
12\frac{1}{2}21
111
111, 2\sqrt{2}2, 3\sqrt{3}3
cosθ=sin(90°−θ)\cos θ = \sin(90° - θ)cosθ=sin(90°−θ)
60°60°60°
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