L'Hôpital's Rule
If the limit of the function gives us 0/0 or ∞/∞, L'Hôpital's Rule says we can take the derivative of the numerator and the derivative of the denominator and see if we get a determinate expression.
If we get

we can do this:

Other types of indeterminate forms:

-more to come
If we get

we can do this:

Other types of indeterminate forms:

-more to come