$-\int\:\frac{x-3}{\left(5-4x-x^2\right)^{\frac{3}{2}}}dx$
$-0.8a-8=0.2a$
$2x-6+4x$
$\cos\left(x\right)^2+4\sin\left(x\right)=4$
$\int\:\sqrt{9-x^2}\left(9-2x\right)dx$
$2n^2+9n+10$
$15y^3+20y^2-5y^4-10y^5$
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