$\lim_{h\to0}\left(\frac{\sqrt{x+h+1}-\sqrt{x+1}}{h}\right)$
$xy+3+3x^2=5$
$x2-8x+4$
$\left(15c-20d^2\right)\left(30c^2+300cd^2-40d^2\right)$
$-13\cdot14$
$\left(6mnu^2-4mnu^3+2mnu\right)$
$16+24g+9g^2$
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