$\left(3x+\frac{2}{5}\right).\left(3x-\frac{2}{5}\right)$
$f\left(x\right)=\frac{x^2-2x-3}{x-1}$
$-3x-4x=15+\frac{x}{2}$
$2^{2^4}$
$\:2ab+4a,\:a=3,\:b=1$
$\lim_{x\to0}\left(\left(5x+1\right)^{cotx}\right)$
$\lim_{x\to\infty}\left(3+4x\right)^{\frac{1}{x^3}}$
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