$49s^{14}-70s^7t^4+25t^8$
$\left(a-3\right)\cdot\left(a-3\right)$
$\left(4-5^4\right)$
$6-3.\left[-5-\left(-7-8\right)\right]$
$f^2+6f+9$
$\int\sqrt{25-x^2}x^3dx$
$\frac{x^2+x}{2}-\frac{x-1}{2}$
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