They tell us that right over here. So this is equal to five. We wanna find the derivative of y with respect to t. They tell us what y is. Y is pi over four. This, y is pi over four, so we know this is pi over four. And let's see, we have to figure out what, we still have two unknowns here. We don't know what x is, and we don't know what the derivative of y with respect to t is.