$100y^4-121z^8$
$\left(9x^a+4y^b\right)\left(9x^a-4y^b\right)$
$x^2+14x+9$
$+43+2$
$\left(x+2y\:-\:r\right)^2$
$\lim_{x\to\infty}\left(\frac{17x}{17x+10}\right)^{8x}$
$12sin^2t+4cos^2t$
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