$81w^2-18w-1$
$\int2v^5dv$
$5y^2\left(20y^6-15y^4+40y^2\right)$
$-2\left(3b-36\right)=3b$
$\left(x+1\right)\left(x+5\right)$
$\left(-14\right).\left(-32\right)$
$cosa=\frac{1}{2}$
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