If you want to find the cos you look at the x values on the circle. So for example if you wanted to know cos 30 the x value would be (square root of 3)/2. So cos 30=(square root of 3)/2. Then if you wanted to find the sin of something you look at the y values on the circle. For example if you wanted to find the sin 30 the y value would be 1/2. So then sin 30=1/2. To find tan of something life gets a bit more difficult. This is because tan theta= sin theta/cos theta. I'd give an example but I'm not to skilled in this field. :P
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Amber CI am in Pre Calculus and this is my blog. Archives
April 2015
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