$\left(a-3\right)\left(b+9\right)$
$x2\:+\:x\:-\:6\:<\:0$
$\frac{\cos^2y}{1+\sin y}$
$\frac{8a^9-y^9}{2a^3-y^3}$
$x+15>12x+3$
$5\left(-1\right)-1$
$\frac{2}{\pi}\int_0^1\left(x^2\cdot cos\left(wx\right)\right)dx$
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