So the derivative of one minus 0.1t whole thing squared with respect to one minus 0.1t is going to be, so I'm essentially taking the derivative of this whole pink thing, with this whole expression squared with respect to the expression. So that's going to be two times one minus 0.1t. And now I can find the derivative of this inner expression with respect to t. So derivative of this inner expression with respect to t is just going to be zero minus 0.1. So it's just going to be negative 0.1. So it's gonna be negative 0.1. And of course, we can simplify this a little bit. This is going to be equal to, if we take 80 times two is 160, times negative 0.1.