So we have the negative 2 3rds, actually let's not forget this minus sign, I'm gonna write it out here. So you have the negative 2 3rds, you multiply the exponent times the coefficient, it might look confusing, pi squared, but that's just a number. So it's gonna be negative, and then you have negative 2 3rds times pi squared, times pi squared, times x to the negative 2 3rds minus one power. Negative 2 3rds minus one power. So what is this going to be? So we get g prime of x is equal to, is equal to seven cosine of x, and let's see, we have a negative three times a negative sine of x, so that's a positive three sine of x. And then, we're subtracting, but then this is going to be a negative, so that's going to be a positive.