Question: is arcsin equal to csc?
Answer: arcsin is the inverse of the sin function. Meaning that sin(arcsin(x)) = x. (note that arcsin is multi-valued, so arcsin(sin(x)) need not always be x). cosecant is the reciprical of the sin function or 1/sin(x) so that csc(x)*sin(x) = 1 when it is defined.