$-x^2+6x-9$
$2-11+1$
$\frac{2}{1+\cos\left(x\right)}+\frac{2}{1-\cos\left(x\right)}$
$x^2-x+xy$
$4\left(d^2-3\right)-\left(d^2-1\right)$
$-151+412$
$\left(x^2-1\right)^2<4x^2$
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