$\int\left(\frac{1}{\sqrt{16-s^2}}\right)dx$
$2x^2-14x+1=0$
$7x^2+21x-28$
$\left(x^2-2x\right)^2-3x^2-2\left(x^2-3\right)\cdot\left(x^2+3\right)$
$-3\left(4-5\right)$
$\left(7s+2t\right)\left(7s-2t\right)$
$\left(4m^2+2y\right)^2$
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