$\int_1^4\left(\frac{x-16}{x\left(x^2+16\right)}\right)dx$

$\int z^3n^2dz$

$\frac{19}{2x-10}\le-5$

$f\left(x\right)=\frac{\left(x^3+3x\right)^2}{\left(x^4-2\right)}$

$6x^3+y^4=6x$

$\int\frac{-x^2-5x+11}{\left(x^2-1\right)\left(x^2+4\right)}dx$

$a^2+4a^2+6a\cdot63ab$