Question

integrate (x+1)/(x^2+1)

Answer 1

\[\int\limits (x+1)(x^2+1) = \int\limits x ^{3} + x ^{2} + x +1= x^4/4 + x^3/3 + x^2/2 + x\]

Answer 2

it should be \[(x+1)\div(x^2+1)\]

Answer 3

.5 ln (x^2+1) + inverse tan (x) + c

http://www.wolframalpha.com/input/?i=Integral+of+%5B%28x%2B1%29%2F%28x%5E2%2B1%29%5D+dx