$3n^2\cdot2n$
$\int\left(2x-1\right)e^{3x^2-3x+5}dx$
$\left(a^2-6b-9\right)^2$
$-4x^2=0$
$\left(b+13\right)^2$
$3x+8\le x+20$
$\frac{\sin\left(2x\right)}{\sin\left(x\right)\cos\left(x\right)}$
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