Posted by RAYMOND on Thursday, August 27, 2009 at 8:44pm.
(cosx)^2 = 2sinxcox
(cosx)^2 - 2sinxcosx = 0
cosx(cosx - 2sinx) = 0
cosx = 0 or cosx = 2sinx
if cosx=0 then x = pi/2
if cosx = 2sinx
sinx/cosx = 1/2
tanx = 1/2
x = .46365
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