$9b^2-30a^2b+25^4$
$1-\tan\left(x\right)^2.\cos\left(x\right).\sin\left(x\right)$
$2+6x+8\left(x-8\right)$
$\int\left(\frac{2x}{\sqrt{x^2-4x+13}}\right)dx$
$y+2y+y^2+2x^2$
$\frac{2}{x+2}+\frac{2}{x-4}=1$
$5cd+\left(-10cd\right)$
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