So let's do values less than zero, negative infinity to zero, and then values greater than zero, infinity, zero to infinity. I could do test values, let's say, I'll use negative one and one. And you have to be careful when you use these, you have to make sure that we are close enough that nothing unusual happens between these test values up until we get to that candidate inflection point. And now what's the sine of our second derivative when x is equal to negative one? When x equals negative one, so let's see, negative one to the fifth power is negative one cube root of negative one is negative one. And so we're gonna have negative 2 9ths divided by negative one is gonna be positive 2 9ths. So our sine right over here is gonna be positive.