hi, how do you find if the mapping of a function is one-one, many-one or many to many?
a) y= tanx
b) y = y= x^2 - x - 2
c) y^2 = x + 1
do i need to sketch the curve or something?
my second question is i know how to find the range and domain but do you need to ALWAYS sketch a curve for a given function or is there a method that maybe can be done with inspection?
thanks a lot