Find the derivative of f(x)=log2(x2+1)f(x) = \log_2(x^2 + 1)f(x)=log2(x2+1).
2x(x2+1)ln(2)\frac{2x}{(x^2+1)\ln(2)}(x2+1)ln(2)2x
2xx2+1\frac{2x}{x^2+1}x2+12x
1(x2+1)ln(2)\frac{1}{(x^2+1)\ln(2)}(x2+1)ln(2)1
x2+1ln(2)\frac{x^2+1}{\ln(2)}ln(2)x2+1