$7x^2+2x+9x+2x^2$
$\frac{12}{x^2-2x-35}$
$\int\left(2x+4\right)\left(x^2+4x+5\right)dx$
$\int\left(2x^2+3x\right)^3\:dx$
$\frac{1}{1+tan^2w}$
$w=in\left(x^2+y^2+z^2\right),\:x=cost,\:y=sent,\:z=4\sqrt{t\:},t=3$
$\int_2^{\infty}\left(\frac{1}{xln\left(x\right)}\right)dx$
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