$tan^2\left(u\right)sin^2\left(u\right)=tan^2\left(u\right)-sin^2\left(u\right)$
$3-\frac{3}{4x^2-1}=2$
$\lim_{x\to\infty}\left(\frac{xe^{2x}}{2}\right)$
$\frac{x-5}{8-2x}$
$\int\frac{x^3+x+1}{x\left(x^2-1\right)}dx$
$\frac{9x-8}{\left(x-3\right)\left(2x-5\right)}$
$\lim_{x\to0}\left(\frac{x.tanx}{sin3x}\right)$
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