$3z-6$
$\int\left(\frac{x^2}{\left(15+6x-9x^2\right)^2}\right)dx$
$\lim_{x\to-5}\left(\frac{x^4+2x^3+x^2}{x+1}\right)$
$\tan\left(x\right)-2=3.5$
$\frac{sen^2x+cos2x}{2cos^2x}=\frac{1}{2}$
$6\cdot15-7$
$\int\left(x\cdot\left(ax^3+b\right)^4\right)dx$
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