$\left(5x+5n\right)\left(5x-5n\right)$
$3x+1\left(3x^3-5x^2+4x+2\right)$
$\lim_{x\to1}\left(-2x^2+4x-2\right)^{3x+5}$
$3x-4x^3+8-2x^3-5x$
$\lim\:_{h\to\:\:0}\left(\frac{\left(5x+h\right)^2-25x^2}{h}\right)$
$14r\:+\:14\:-\:r\:-\:6$
$\lim_{x\to0}\frac{4\sin\left(x\right)\cos\left(2x\right)}{x}$
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