## Trigonometry (10th Edition)

1. Set up calculator in degrees $\tan15^{\circ}\approx0.2679$ $\cot75^{\circ}\approx0.2679$ 2. Pick up more examples $\tan10^{\circ}=cot80^{\circ}\approx0.1763$ $\tan53^{\circ}=cot37^{\circ}\approx1.327$