$\left(-25\right)\cdot\left(-9\right)$
$y4+4+2y^2$
$\frac{3x^3-2x^2+6x-4}{x-5}$
$\int\left(\frac{-1}{9x^2-12x+9}\right)dx$
$\int\frac{2x^2-x+2}{x^2\left(x^2-2x\right)}dx$
$cosxcos2x+sinxsin2x=\frac{\sqrt{3}}{2}$
$\frac{x^2+5x-7}{x+3}$
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