Question 63598
cos[{{{pi}}}/2-x]/sin[{{{pi}}}/2-x]
1/tan[{{{pi}}}/2-x]
1/tan^-1(x)
tan(x)
{{{graph(300,300,-10,10,-10,10,cos(3.141592653/2-x)/sin(3.141592653/2-x))}}}