Exercise 4.5.2 solution
\( \dfrac{b}{3.56}=\cot39.6^\circ\), so \(b=3.56\cot39.7^\circ=\dfrac{3.56}{\tan39.7^\circ}\approx4.29\).
\( \dfrac{c}{3.56}=\csc39.6^\circ\), so \(c=3.56\csc39.7^\circ=\dfrac{3.56}{\sin39.7^\circ}\approx5.57\).
\( \dfrac{b}{3.56}=\cot39.6^\circ\), so \(b=3.56\cot39.7^\circ=\dfrac{3.56}{\tan39.7^\circ}\approx4.29\).
\( \dfrac{c}{3.56}=\csc39.6^\circ\), so \(c=3.56\csc39.7^\circ=\dfrac{3.56}{\sin39.7^\circ}\approx5.57\).