$\lim_{x\to+\infty}\left(\frac{x+6}{x}\right)^{2x}$
$e^{\sin\left(3.14\right)}$
$x-6-\left(\frac{1}{3}\right)x$
$+5=-3$
$2sin^2-6sin=8$
$4x+5y\:=21$
$\frac{4x^2-9y^2}{2x+3y}$
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