Let's do another example. Let's say that we're told that f of x is equal to the cube root of x, and we wanna figure out what f prime of x is equal to. Pause the video and see if you can figure it out again. Well, once again, you might say, hey, how do I take the derivative of something like this, especially if my goal, or if I'm thinking that maybe the power rule might be useful? And the idea is to rewrite this as an exponent. If you could rewrite the cube root as x to the 1 3rd power. And so the derivative, you take the 1 3rd, bring it out front, so it's 1 3rd, x to the 1 3rd minus one power.