$x^2=45$
$600-209$
$x-8=6$
$\int\frac{2x^2-8x}{x^2-4x-5}dx$
$\left(a^{x+1}-2b^{x-1}\right)\left(2b^{x-1}+a^{x+1}\right)^2$
$36x^2-108\sin x+81$
$5ax+10ax^2$
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