$\lim_{x\to0}\left(\frac{4}{1+x}\right)$
$\left(x+w+y+z\right)^2$
$\int\frac{x-1}{4x^2-4x+3}dx$
$\int\left(x^2+1\right)\sqrt{4x^2+1}dx$
$x-\frac{3}{4}x+\frac{2}{3}x$
$\left(5a^2-6b^4\right)^3$
$\frac{1}{2}\left(x^3+9\right)^{-\frac{1}{2}}\left(3x^2\right)$
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