$\int\frac{5x^2+3x-1}{\left(1+x^2\right)\left(x-2\right)}dx$
$3\sin^22x-1=0$
$d=x^2$
$\int\left(\frac{1}{5cos\left(x\right)^2}\right)dx$
$xy\left(x+2y\right)-2xy^2$
$\frac{z^{10}-z^{10}}{z+1}$
$27x^3+125y^3$
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