$\frac{3}{4}x^2y-\frac{8}{9}xy^2$
$dy-y^2=xdx$
$z^2-16z$
$8xy+6x+24y$
$-\left(-3\right)+10+7+\left(-8\right)+27$
$-x^2-3x-2;\:x=-1$
$cos2x=1-2sinx$
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