$\left(5x-4y^2\right)\left(5x+4y^2\right)$
$d x + e ^ { x + y } d y = 0$
$\lim_{x\to\infty}\left(3x^4-4x^3\right)$
$-5x-12\ge48$
$-3-2-4-1-7-10$
$t^2+t-2$
$\left(4a+3b\right)^3$
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