$13.682-7.4361x+1.2982x^2;x=30$
$\left(x-8\right)^2\left(x^4+8x^2+64\right)$
$49x^2+14x$
$\int_5^8k\left(2-x\right)dx$
$\left(x^a-y^{2a}\right)^2$
$y^2+2xy=0$
$4-\left(-3\right)^2$
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