$\cos\left(2\cdot\frac{5\pi}{6}\right)$
$25a^6+20a^3n+4n^2$
$\left(3x^2-2x\right)^3$
$b\frac{5}{2}\cdot b^4$
$\int\frac{\left(y+3\right)}{\left(2y+1\right)}dy$
$-x^2+14x+57$
$\int x\left(\frac{x}{\sqrt{7+x^2}}\right)dx$
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