Computing basic trig functions

\(sin\,36^{\circ}\approx 0.58779\)      Set hairline to 36 on \(\theta\), read 0.588 on P.
\(tan\,36^{\circ}\approx 0.72654\) Set hairline to 36 on \(\theta\), read 0.727 on T.
\(cos\,36^{\circ}\approx 0.80902\) Set hairline to 36 on \(\theta\), set left index of Q under hairline, read 0.809 opposite right index of P.

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