$\frac{3}{9}x^2+\frac{7}{9}x+\frac{2}{9}$
$12x^2y^2+15xy^2+6x^2y$
$2000+2600$
$4\left(-1^2\right)\left(-2\right)-3\left(-1^4\right)\left(-2\right)\left(2\right)$
$\left(-90\right)-\left(-20\right)$
$y+xy=x^2y'$
$\cot\left(x\right)=-\csc\left(x\right)$
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