$\lim_{x\to\infty}\left(5x-4\right)^{5x+1}$
$\left(x-3\right)\left(4x+2\right)$
$cos^2x-cos^4x=\frac{1-cos4x}{8}$
$3x-5\le10$
$25-110y^2+121y^2$
$9a^2+9a+36$
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