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Posted by Lea on Saturday, May 8, 2010 at 12:13pm.

ctgx+cosx=1+ctgx*cosx

LS = cotx + cosx = cosx/sinx + cosx = (cosx + cos^2x)/sinx RS = 1 + cotx(cosx) = 1 + cosx/sinx(cosx) = 1 + cos^2x/sinx = (cosx + cos^2x)/sinx = LS

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