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10:10
Khan Academy
Ashish Gupta
Trigonometric ratios for common angles
In this video, we look at the trigonometric rations (sin, cos, and tan) for some common angles. We first define the trigonometric ratios as the coordinates of points on the unit circle. First we look at the multiples of pi/2. We then use geometry (right angled triangles and equilateral triangles) to find the coordinates for some other common ...
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