$2csc\left(2x\right)=tanxcotx$
$\int_0^{\pi}\left(\frac{1-cosx}{x^2}\right)dx$
$\lim_{x\to\infty}\left(1+\frac{8}{x^6}\right)^{x^6}$
$4x^2-36x+81$
$-6x-6=-6x-103$
$sen\left(x\right)\cdot\left(csc\left(x\right)+1\right)$
$u\left(u-1\right)\left(2u+1\right)=0$
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