### 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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