Since ##cos2x=cos^2x-sin^2x=1-2sin^2x=2cos^2x-1## and ##sin2x=2sinxcosx## then: ##(1+2cos^2x-1)/(2sinxcosx)=cotxrArr## ##(2cos^2x)/(2sinxcosx)=cotxrArr## ##cosx/sinx=cotxrArr## ##cotx=cotx##.
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