$xsec\left(u\right)dx-uxdx+uxdx+x^2du=0$
$n^2<4n-3$
$a+6a-20a+150a-80a+31a$
$2x^3+6x-2$
$2\cos^2\left(3x\right)-1=0$
$36m^2-84m+49$
$\left(8m+8\right)\left(m-8\right)$
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