$\frac{\left(x^2-1\right)\cdot dy}{y^2-4}=dx\cdot2$
$\left(bc+4a^2\right)^3$
$\int-6xe^{6x^2}dx$
$49^2b^4-12n^6m^{10}$
$\lim_{x\to-2}\left(4x^2-8x+3\right)$
$\frac{\left(a+b+c\right)^4-\left(a+b+c\right)^4}{c}$
$-20a+45a$
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