$\int3x^2\left(x^3+9\right)^8dx$

$\frac{7}{x-5}+\frac{4}{3x-15}$

$\frac{sec\left(x\right)+cot\left(x\right)\csc\left(x\right)}{\sec\left(x\right)\tan\left(x\right)+\csc\left(x\right)}$

$4n^2+2n+6=0$

$\int\frac{72x}{\left(6x^2+1\right)^3}dx$

$x\left(8x^7\right)$

$9x^2+36x+36$