$\left(6y^2+1\right)\left(6y^2-8\right)$
$a+1-2xy-3+xy-2$
$2p^2+3p^2+5-1$
$x\::2<9$
$\frac{\tan^2x}{\sec x}\left(\sec x-\cos x\right)$
$\int19x^3\cdot e^xdx$
$y=3x-xy-y+3$
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