$21m^2n^3-28m^3n^2+35m^3n^3$
$x^2+4y-5=0$
$\lim_{x\to0}\left(\frac{x-4}{x+2}\right)^2$
$\left(x\cos y\right)\left(xcosy\right)$
$2\sin x+5=6$
$\left(x^2-a^2\right)\left(a^2-x^2\right)$
$-7+9c-13c+12$
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