For various functions

which is the slope of the tangent line to the graph of **f** at **x = a**.

You can use the default function

- Try various values for
**a**and see if you can determine the pattern. - Change the exponent 2 to other values and again try various values for
**a**and see if you can determine the pattern. - Consider the square root function (sqrt(x)) and see what happens at
**a = 0**. - Repeat the previous exercise with the absolute value function (abs(x)).