$x^2-x-56<0$
$8^2+26x+15$
$4u^2-36u+81$
$0-2\cdot0\le4$
$\cos\left(100\right)-\cos\left(200\right)$
$6\cos\left(x\right)^2\sin\left(x\right)^2$
$3x+4\cdot3x-4$
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