$\int\left(9x^2+18\right)ln\left(x\right)dx$
$154:-7$
$\frac{x^2+5x+4\:}{x^2+6x+8}$
$x^2-6x-135$
$3\left(x-1\right)^2+\left(3x+1\right)^2$
$\int x^2-x+4\left(x-1\right)\left(x^2+16\right)dx$
$\frac{\left(1+\sec^2\left(x\right)\right)}{\tan^2\left(x\right)}=1$
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