$\left(6u-8\right)\left(6u+8\right)$
$\lim_{x\to\infty}\left(1+\frac{2}{n}\right)^{7n}$
$x^2+28x+81$
$\frac{8x^{6}-10x^{4}-12x^{3}}{-4x^{2}}$
$\sqrt{3}tan\:x-1=0\:$
$\int\frac{1}{\sqrt[2]{121-4x^2}}dx$
$2cos2x+2cosx=0$
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