![]() Now that we've done some practice, do some more on your own! In no time at all, you'll be ready for any upcoming unit circle quiz. First two capital letters form sin, next two form cos and last. Now suppose that O stands for opposite side, H for hypotenuse and A for adjacent side. Now look at all the capital letters of the sentence which are O, H, A, H, O and A. ![]() Tan θ = sin θ cos θ, cot θ = cos θ sin θ, sec θ = 1 cos θ, csc θ = 1 sin θ \tan \theta = \frac = 2 csc 6 π = s i n 6 π 1 = 0.5 1 = 2 It will help you to memorize formulas of six trigonometric ratios which are sin, cos, tan, sec, cosec and cot. Memorizing the unit circle is actually much easier than you'd think, thanks to a couple little tricks:īecause of the following 4 equations, we only need to memorize the unit circle values for sine and cosine. Now, the next natural question is, how can I remember the unit circle? How to Memorize the Unit Circle: You should know both, but you're most likely to be solving problems in radians. As you can see, listed are the unit circle degrees and unit circle radians. The magic hexagon can help us remember that, too, by going clockwise around any of these three triangles: And we have: sin 2 (x) + cos 2 (x) 1. This above unit circle table gives all the unit circle values for all 4 unit circle quadrants. Chart of simplified unit circle with sin cos tan sec csc and cot
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