函数图像
tan(x)
cot(x)
sec(x)
csc(x)
arcsin(x)
arccos(x)
arctan(x)
arccot(x)
ln(x+sqrt(x^2+1))
(e^x-e^(-x))/2
(e^x+e^(-x))/2
-->
tan(x)
cot(x)
sec(x)
csc(x)
arcsin(x)
arccos(x)
arctan(x)
arccot(x)
ln(x+sqrt(x^2+1))
(e^x-e^(-x))/2
(e^x+e^(-x))/2