A Level

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

Problem

\int \frac{\sqrt{x^2 + 1}}{x^4}\,dx =

(a)

-\frac{1}{3}\frac{(x^2 + 1)^{3/2}}{x^3} + C

(b)

x^3 (x^2 + 1)^{-1/2} + C

(c)

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

(d)

-\frac{1}{3}\frac{(x^2 + 1)^{3/2}}{x^2} + C