$\lim_{x\to+\infty}\left(-4e^{-x}\right)$
$4x-5y-3x+6y-8-x+y\:\:\:$
$\:972,4-39,67$
$4x^4-20x^2\:z+25z^2$
$2.36\:-10.58$
$\frac{d}{dx}7x^5$
$ax^2+a$
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