2 after the log function is actually the base.
derivative of log(x)= 1/x
derivative of a^x = a^x lna
The Attempt at a Solution
= 2^log2(x^2+1) ln2 *d[log2(x^2+1)]/dx
= 2^log2(x^2+1) ln2 [2x/(x^2+1)ln2]
ln2 in the numerator cancels with that in denominator but at the back of the book the answer written is x^2+1 which i'm not getting.