I'm finding this calculus problems interesting yet have trouble with a lot of them. hopefully this forum can help me

anyway....there is this derivative problem....

f(x)=x-2/x^2+1 Square root

f(x)=lim f(x-h) - f(x)/h

h>0

f(x)= lim x+h-2/(x+h)^2+1 Square root - x-2/x^2+1 Square root

h>0 /h

man, I hope that's understandable. hopefully someone can teach me how to do square roots and other stuff

just in case, the square roots go in x^2+1, (x+h)^2+1, and x^2+1 which are all denominators. and the h divides everything in the third part

anyway, I do have the answer.... 2x+1/(x^2+1)^3/2

I just don't know how to get there. I know the first step would be to cross multiply the ones in the 3rd part. I get lost after that