$\left(a^2-2\right)\left(a^2+7\right)$
$x^2y+-3yx+2yx+-2yx+yx$
$\left(7m-9\right)^2$
$\int_1^2\:\left(\frac{15}{\sqrt{4-x^2}}\right)dx$
$8m^3n^5g^4\cdot2m^5n^7g^3$
$\int10sen\left(10x\right)cos^5\left(10x\right)dx$
$\left(y+5\right)\left(y-7\right)=y^2-12y-35$
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