$4x^2+\:8xy\:-\:60y^2$
$\left(\frac{x^3}{7}-\frac{7}{11}y^2\right)^2$
$12xy+9y^2-4x^2$
$-x^2+288x-1136=0$
$y'=\frac{3x}{2y}$
$4cos+6=5$
$6c^2-13c+3$
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