$2x^2+16x+12$
$\int\:\frac{x^2}{\left(9+x^2\right)^{\frac{3}{2}}}dx$
$-2^2-8x-2+1$
$\frac{sin4x}{sin2x}=2cos2x$
$\left(3xy\right)\left(-6x+y\right)$
$a^2-6a$
$\int_{\frac{\pi}{2}}^{\frac{\pi}{2}}\frac{x^2\sin x}{1+x^6}dx$
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