Trig Ratios for positive multiples of
30°, 45° and 60°
Using the trig ratios of 30°, 45°, and 60° it is possible to calculate other exact values of any multiples of these without a calculator, such as the sin, cos or tan of 120° , 135°, 150°, 210°, 225°, 240°, 300°, 315° and 300°.
In the next video tutorial I show you how to calculate some of these, however you should be familiar with the quadrant rule and the trig ratios for 30, 45 and 60° before you start this though.
Positive Multiples of 30°, 60° and 45° trig ratios
Negative Multiples of 30°, 60° and 45° trig ratios
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