Is there a way to learn the Unit Circle or do I need to memorize it?
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Anonymous2009-01-22 22:05
memorize it dumbass. It's not that hard.
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Anonymous2009-01-22 23:30
If you understand what it represents, there's really nothing to learn. The people who "memorize" it are retards who can't grasp simple geometric concepts.
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Anonymous2009-01-22 23:35
There's a circle of radius 1, which means that the circle at centre (0,0) hits the X and Y axes at -1, 1 in all directions. There's really not that much to remember
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Anonymous2009-01-23 0:00
So the special angles are 0, 30, 45, 60 and 90 (After those all the values for sin/cos just repeat)
The sin of those angles go sqr(0)/2 sqrt(1)/2 sqrt(2)/2 sqrt(3)/2 and sqrt(4)/2. Easy to remember, 01234.
Cos is the same thing but in reverse.
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Anonymous2009-01-23 0:06
I just memorize a triangle all 60 degree angles and side lengths 2, cut it in half, and put root3 on the unknown side by Pythagorus. I also memorize a square with side lengths 1, cut it in half along a diagonal, and put root2 on the unknown side by Pythagorus. I thus have exact values for trig ratios for 30, 60, and 45 at my fingertips, and those angles are reference angles for the rest of the unit circle, whose trig rations may be negative depending on which quadrant they are in. Put in the sine and cosine for quadrantal angles 0,90,270 and it's done.