$2xy+3x+4xy$
$4x-3y-65=0$
$\lim_{x\to\infty}\left(\frac{e^{5x}}{e^{5x-1}}\right)$
$\frac{1}{x+2}-3$
$\frac{4x}{x^2-4}.\frac{x+2}{16x}$
$x2-2x+27=0$
$\left(1+sinx\right)\left(1-sinx\right)=\frac{1}{sec^2x}$
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