$2u^2+18u+28=0$
$-18a+15a$
$36x^2-18xy+4y^8$
$\left(sin\left(x\right)-1\right)\left(-2sin\left(x\right)\right)\left(sin\left(x\right)-1\right)+\left(-cos^2\left(x\right)\right)$
$x^3-6x^2+7x+4$
$\frac{\left(x+\sqrt{x}\right)dy}{dx}=1+y$
$\frac{2xy}{4y^2}$
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