$125x^3-64y^{12}$
$x^2-18xy+81y^2$
$\left(a+b\right)\left(b-a\right)=a^2-b^2$
$y^2-28y+y$
$2g-6g$
$\cot\left(x\right)x\sec\left(x\right)$
$\int8x^7dx$
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