$16-a^2$
$\lim_{x\to4}\left(5x-2\right)$
$\sqrt{x+8}+\sqrt{x+3}=5$
$-68+45$
$\frac{x^3+4x+3}{x+3}$
$\int3x^{2}e^{2x}dx$
$\int10x^{\frac{3}{7}}dx$
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