Let's say we wanted to find the limit as x approaches 0 of sine of x over x. Now, if we just view this, if we just try to evaluate it at 0 or take the limit as we approach 0 in each of these functions, we're going to get something that looks like 0 over 0. Sine of 0 is 0, or the limit as x approaches 0 of sine of x is 0, and obviously as x approaches 0 of x, that's also going to be 0. This is our indeterminate form. If you want to think about it, this is our f of x. That f of x right there is sine of x. Our g of x, this g of x right there for this first case, is the x. g of x is equal to x, and f of x is equal to sine of x.