$2-44$
$\frac{2sec^2\left(x\right)}{tan\left(2x\right)}$
$\int\left(-\frac{2}{x^2}\right)dx$
$4a=3b-121$
$\sqrt{\frac{9x^6}{y^4}}$
$( x ^ { 2 } + x - 2 ) ( - x + 3 )$
$\lim_{x\to0}\left(\frac{x^4-1}{\ln x}\right)$
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