Which expression is the result of 1x+h−1x\frac{1}{x+h} - \frac{1}{x}x+h1−x1 divided by hhh?
−1x(x+h)\frac{-1}{x(x+h)}x(x+h)−1
1x2\frac{1}{x^2}x21
hx2+xh\frac{h}{x^2+xh}x2+xhh
−hx2+xh\frac{-h}{x^2+xh}x2+xh−h