$4\left(3x-5\right)$
$\lim_{x\to4}\sqrt{x}$
$a^2+b^2=17$
$3\:\frac{3}{5}\cdot5$
$\int\frac{2\sin\left(x-1\right)}{\cos^2x}dx$
$\left(x+y+1\right)e^xdx+\left(e^x+e^y\right)dy=0$
$\frac{6x^2+21x-11}{x+4}$
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