$\lim_{x\to\infty}\left(2\:cos\:x\:+tan\:x\right)$
$\lim_{x\to3}\left(\frac{5\left(x-3\right)\sqrt{x+13}}{4-\sqrt{x+13}}\right)$
$\int5e^{-4x}dx$
$8+2x-16+x+1$
$6x^2+13x-8$
$-12x-4x-7x$
$x^3+5x^2-9x-45$
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