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6:37
Khan Academy
Ashish Gupta
Using the unit circle to find ratios of common angles
We've learnt how to find the trigonometric ratios for some common angles like pi/3, pi/4, and pi/6. In this video, we'll move beyond the first quadrant to get 9 more points on the unit circle. Using symmetry, we'll find the coordinates of these points which will help us figure out the cos and sin of these angles.
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