$\lim_{x\to1}\left(sen\left(3x\right)x^2-1\right)$
$\frac{3u+4}{-u-3}$
$4cos\left(a\right)=0$
$x+2y+-4y+6x+2x$
$\left(x-5\right)\left(a+2\right)$
$\frac{2}{3}x+15=17$
$\lim_{x\to0}\left(\frac{7sin\left(x\right)}{x}\right)$
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