Practice problem
What is the derivative of f(x)=1x2+1f(x) = \frac1{x^2+1}f(x)=x2+11?
12x\frac1{2x}2x1
−2xx2+1\frac{-2x}{x^2+1}x2+1−2x
−2x(x2+1)2\frac{-2x}{(x^2+1)^2}(x2+1)2−2x
2x(x2+1)2\frac{2x}{(x^2+1)^2}(x2+1)22x
2xx2+1\frac{2x}{x^2+1}x2+12x
Type a concept, like “slope” or “photosynthesis”.