$\left(a^2b+2x\right)\left(a^2b+11x\right)\:$
$-4x\ge10$
$x^2y^2-49$
$2xy+4-x+3xy$
$\cos\left(100\right)-\cos\left(200\right)$
$6x^2+12x$
$\left(5x-3\right)\left(15x+6\right)$
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