$x^2+5x+29$
$1-cos\left(2x\right)=cot\left(x\right)sin\left(2x\right)$
$\left(\frac{xy-x}{y^2-1}\right)\left(\frac{y+1}{x+2}\right)\left(\frac{2x+4}{5x}\right)$
$-\lim_{y\to0}\left(\frac{sen\left(cosy\right)}{y^2}\right)$
$\frac{8x^3-3x^2+7}{\frac{1}{2}}$
$2x+3=x+8$
$10x^2\:\left(\:8x^3\:-\:7x\:-\:6x^5\right)$
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