Question

differentiatef(x)=1/1+x^2

Answer 1

I suck at quotient rule so I'll use the power and chain rules..
f(x) = (1+x^2)^(-1)
f'(x) = -1(1+x^2)^(-2)*(2x)

Answer 2

or
f'(x) -2x/(1+x^2)^2

Answer 3

2x

Answer 4

ackhat, i dont think he meant that

Answer 5

))))

Answer 6

but i agree, people do need to learn how to use parenthesis

Answer 7

(1 + x^2)' = 2x
f'(x) -2x/(1+x^2)^2