\(\displaystyle \int \frac{x+2}{x^{2}-4}\,dx=\) ?
\(\displaystyle \int \frac{3\,dx}{\sqrt{\,1-9x^{2}\,}}=\) ?
\(25\displaystyle \int \sec5x\,\tan5x\,dx=\) ?
\(\displaystyle \int \sec^{2}4x\,dx=\) ?
\(\displaystyle \int \frac{dx}{1+36x^{2}}=\) ?