$\left(r-2s+3t\right)^2$
$\left(\frac{x^2}{9}-\frac{1}{x^2}\right)^4$
$\log7=\log\left(x+7\right)-\log6$
$x^3-8^2+19x-12$
$\lim_{x\to\infty}\left(\frac{\sqrt{x+1}-2}{x-3}\right)$
$\frac{\left(\sin\left(3x\right)\right)}{\left(\cos\left(2x\right)\tan\left(2x\right)\right)}$
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