$3x^3y^2+9x^2y^2-18xy^2$
$2\left(1-\cos^2\left(x\right)\right)+cos^2x=1+sen^2x$
$15a^{2}b^{2}+3a^{2}b^{2}+\left(-6a^{2}b^{2}\right)$
$1-11k+3$
$\frac{dy}{dx}=\frac{-y^2}{x\left(x-y\right)}$
$\frac{\left(-2x^2-6y^2\right)}{y^3-x^2y}$
$-16x^4y^3-xy^4$
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