$\left(2a-b^x\right)\left(2a+b^x\right)$
$\lim_{x\to\infty}\frac{\sqrt{1+x}-\left(1+\frac{x}{2}\right)}{x^2}$
$2.29^5$
$-3\left(2+4n\right)+7\left(2n-1\right)$
$x^2+63=0$
$\left(8q^4+6u^4\right)^2$
$\int\left(\frac{x-4}{x^2}\right)dx$
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