And you'll encounter a few other techniques further on once you learn more calculus. Then you fall on the baseline, approximation. And approximation, you can do it numerically. Try values really, really, really, really close to the number you're trying to find the limit on. You know, if you're trying to find the limit as x approaches zero, try 0.00000000001. Try negative 0.0000001. If you're trying to find the limit as x approaches four, try 4.0000001.