$\int \frac{dx}{e^x - 1} = $

$\int \sin ^3(x) \cdot \cos ^3(x) \, dx =$

If $l^r(x)$ denotes the $r$-th iterated logarithm of $x$,i.e.,$l^1(x) = \log(x)$,$l^2(x) = \log(\log(x))$,...,$l^r(x) = \log(\log(...\log(x)...))$,then $\int \frac{1}{x \cdot l^1(x) \cdot l^2(x) \cdot ... \cdot l^r(x)} \, dx = $

$\int \frac{x^{3} \sin \left(\tan ^{-1}\left(x^{4}\right)\right)}{1+x^{8}} d x$ is equal to

$\int \frac{d x}{x^{\frac{1}{2}}+x^{\frac{1}{3}}}=A x^{\frac{1}{2}}+B x^{\frac{1}{3}}+C x^{\frac{1}{6}}+D \log \left(x^{\frac{1}{6}}+1\right)+k$ (where $k$ is the integration constant),then the values of $A, B, C$ and $D$ are respectively,

$\int \frac{\operatorname{cosec} x}{3 \cos x+4 \sin x} d x=$