I think that y=arccsc x would be written as y=1/(sin^-1 x). arcsec is the same ony cosine not sine. That's what I think. DrInv does not draw inverse functions, it simply inverts the x and y coordinates. My thinking is sin^-1 x is the inverse of sin x, so 1/(sin^-1 x) is the inverse of 1/(sin x), and csc x=1/(sin x). -Joseph Have A :-) Nice Day