A Level

MATHEMATICS · Single correct · A Level · Mathematics · Integration · Integration

Problem

\int \frac{x\,dx}{\sqrt{1+x^2} + \left(\sqrt{1+x^2}\right)^3}

is equal to (1)

\frac{1}{2} \ln(1 + \sqrt{1+x^2}) + C

(2)

2\sqrt{1 + \sqrt{1+x^2}} + C

(3)

2(1 + \sqrt{1+x^2}) + C

(4) None of these