$\frac{\csc-1}{\csc^2}$
$8n^2+12n$
$-2a\left(2a+8\right)$
$2x+\left\{-5x-\left\{-2y+\left\{-x+y\right\}\right\}+6\right\}$
$2a^3+b^2-5c-a^3-7b^3+3c$
$5x^3-6+3$
$\frac{1}{x}\sin^{-5}\left(x\right)-\frac{1}{3}x\cos^3\left(x\right)$
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