Problem 857 (difficulty: 2/10)

\(\displaystyle \int{\dx\over 5+4x^2}=? \qquad\qquad \int\Big({1-x\over x}\Big)^2\dx=? \qquad\qquad \int\left(1-{1\over x^2}\right)\sqrt{x\sqrt{x}}\dx=? \)

Give me another random problem!