Exercise 4.2.4 solution
\(\sin30^\circ=\text{ opp/hyp }=\dfrac{1}{2}\)
\(\csc30^\circ=\text{ hyp/opp }=2\)
\(\cos30^\circ=\text{ adj/hyp }=\dfrac{\sqrt{3}}{2}\)
\(\sec30^\circ=\text{ hyp/adj }=\dfrac{2}{\sqrt{3}}=\dfrac{2\sqrt{3}}{3}\)
\(\tan30^\circ=\text{ opp/adj }=\dfrac{1}{\sqrt{3}}=\dfrac{\sqrt{3}}{3}\)
\(\cot30^\circ=\text{ adj/opp }=\sqrt{3}\)