$x^2y^2-xy+xy-1$
$30-\:-10-2+1$
$9x^6+12x^4-4x^2$
$\left(-2x^2y\:+\:y^2=1\right)\frac{dy}{dx}$
$12\sin\left(2\pi x\right)=12$
$3.77\cdot1.125$
$2y^2+8y+5$
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