$\frac{-u+1}{-u-1}$
$9x+27=-9$
$\int4x\left(2x^2+3\right)^3dx$
$\int csc^2\left(u-bx\right)\:dx$
$6a^2+7b^3-10c-5b^3+7c+5c-4^2$
$\lim_{x\to0}\left(\left(5x\right)^{8x}\right)$
$\lim_{x\to0}\frac{\tan\left(5x\right)}{\tan\left(4x\right)}$
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