$9-t\ge2$
$-21x^2-14x+42$
$k^{3}-125$
$\cos\left(2x\right)dx=-\sin\left(3y\right)dy$
$\frac{1}{2}xy+y$
$\sqrt[3]{81}^7v$
$\left(6x^3-y\right)^3$
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