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OpenStudy (mathteacher1729):
Are you having trouble evaluating trig functions? sin(pi/2), cos(pi/4), etc. Here is a short youtube playlist about it: http://www.youtube.com/mathteacher1729#g/c/9FE48FF0B7A3E3F4 Hope this helps all you trig students. :) (or helps those who need to brush up on trig for calc, etc.)
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OpenStudy (anonymous):
Cool Channel! Good Luck
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