I'll write smaller because I'm running out of space. Limit as delta x approaches 0 of 1 over. And of course, we can only do this assuming that delta, well, we're dividing by delta x to begin with. So we know it's not 0. It's just approaching 0. So we get square root of x plus delta x plus the square root of x. And now we can just directly take the limit as it approaches 0.