\[\frac{1+sinx+cosx}{1+sinx-cosx}=tan(x/2)\]
for x=90 tan45=1
for x=180 y approaches to infinity
for x=120 y=1.73
\[\frac{sin(2x)}{1-cos(2x)}=cotx\]
boundary condition x should not be equal to 0
for x=90 y=0
x=45 y=1
\[\frac{sin(2x)}{1+cos(2x)}\]=tanx
x=45 y=1
x=60 y=1.73
x=30 y=0.57
