$\lim_{x\to\infty}\left(\frac{7x}{7x+2}\right)^{x-1}$
$x^2-16x+172$
$\frac{2x^2+3xy}{x^2}$
$w=z^3y\sin\left(x\right)$
$u^2^2\:x^3$
$\sqrt{x^4-3x^2}$
$\left(4-3x\right)^4$
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