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February 1, 2015

February 1, 2015

Posted by **Sean** on Wednesday, May 8, 2013 at 1:02am.

- trig identities -
**drwls**, Wednesday, May 8, 2013 at 6:01amcscx = 8/3

sinx = 3/8

cosx = sqrt [1 - sin^2x] = (sqrt55)/8

cos(2x) = 2 cos^2x -1 = 46/64 = 23/32

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