$\left(2-5y\right)^2$
$12=n-9$
$2\sec^2x-8\tan\:x=-4$
$4x^2+12x-6=0$
$\frac{x^3+6x^2-6x-45}{x-3}$
$4xyz-7xy+8xz+15xy-6yz-2xyz$
$x^3+3x^2-5-6$
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