$\left(xt+4\right)\left(xy-4\right)$
$x+4\le3$
$\lim_{x\to\infty}\left(\frac{5x+2}{5x-1}\right)^{x+4}$
$\frac{x^4}{x^4}$
$3\sin^2x-10\sin x-8$
$\left(x^4+8\right)\left(x^4-2\right)$
$-\left(6x^2+4x-1\right)$
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