prove that cosx/1-sinx=tan(180(45+x/2)
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cosx/1-sinx
sin(pi/2 +x)/1+cos(pi/2+x)
{2sin(pi/4+x/2)cos(pi/4+x/2)}/2cos^2(pi/4+x/2)
sin(pi/4+x/2)/cos(pi/4+x/2)
tan(pi/4 +x/2)
sin(pi/2 +x)/1+cos(pi/2+x)
{2sin(pi/4+x/2)cos(pi/4+x/2)}/2cos^2(pi/4+x/2)
sin(pi/4+x/2)/cos(pi/4+x/2)
tan(pi/4 +x/2)
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