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Precise values of trig functions for specific angles.
sin30°=12\sin 30° = \frac{1}{2}sin30°=21.
cos45°=22\cos 45° = \frac{\sqrt{2}}{2}cos45°=22.
tan60°=3\tan 60° = \sqrt{3}tan60°=3.
csc30°=2\csc 30° = 2csc30°=2 or 1/sin30°=21/\sin 30° = 21/sin30°=2.
sec60°=2\sec 60° = 2sec60°=2, since secx=1cosx\sec x = \frac{1}{\cos x}secx=cosx1 and cos60°=0.5\cos 60° = 0.5cos60°=0.5.
sin30°=1/2\sin 30° = 1/2sin30°=1/2, sin60°=3/2\sin 60° = \sqrt{3}/2sin60°=3/2.
cos0°=1\cos 0° = 1cos0°=1.
cos90°=0\cos 90° = 0cos90°=0, sin90°=1\sin 90° = 1sin90°=1.
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