y=arctanx 渐近线2条：y=-π/2和y=π/2
y=arccotx 渐近线1条：y=0和y=π
y=arcsecx 渐近线1条：y=π/2
y=arccscx 渐近线1条：y=0
y=tanhx 渐近线2条：y=-1和y=1
y=cothx 渐近线3条：x=0、y=-1和y=1
y=sechx 渐近线1条：y=0
y=cschx 渐近线2条：x=0和y=0
y=arctanhx 渐近线2条：x=-1和x=1
y=arccothx 渐近线3条：x=-1、x=1和y=0
y=arcsechx 渐近线1条：x=0
y=arccschx 渐近线2条：x=0和y=0