$+0-1005$
$\frac{\left(n^2+n\right)}{4^n}$
$\int\left(-\frac{1}{2}xe^{9x}\right)dx$
$12.5\left(3+2w\right)$
$25\:-\:16x^2$
$\int\frac{3}{x^2+4}dx$
$4+37uv-4uv-33uv$
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