$9 x ^ { 2 } - 24 x + 14$
$8a^2+14a-15$
$a^2+6^2+9$
$\frac { 2 + 2 } { 4 }$
$\left(+7\left(-9\right)\left(+25\right)\right)$
$u=\sqrt[3]{t^3-\frac{1}{t^3}}$
$\left(4b^3-5\right)^2$
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