**Problem : **
The point (0,0) lies on the graphs of which
functions?

**Problem : **
The point (0,1) lies on the graphs of which functions?

**Problem : **
Which functions have a
range of -1 to 1?

**Problem : **
Which functions approach
âàû
and
- âàû
as
*θ*
approaches zero?

**Problem : **
For which functions are the values between -1 and 1 not in the range?