$2\log\left(x\right)=2\log\left(x+1\right)$
$-1-5+3x-1$
$\left(dx\right)^2+\left(dy\right)^2=0$
$\lim_{x\to0}\left(e^{x^2}-1\right).x^{-2}$
$3pq\left(4-2pq\right)$
$y'+5y=5e^{\left(4x\right)}$
$\frac { 9 x ^ { 2 } - 12 x + 14 } { 3 x - 2 }$
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