So this derivative, this is the same thing as this is going to be seven times the derivative of sine of x, so this is just going to be seven times cosine of x. This one over here, this is going to be three, or we're subtracting, so it's gonna be this minus, we can bring the constant out that we're multiplying the expression by, and the derivative of cosine of x, so it's minus three times, the derivative of cosine of x is negative sine of x, negative sine of x. And then finally, here in the yellow, we just apply the power rule. 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.