$\lim_{x\to2}e^{2x}$
$20yz+25z^2-30zx$
$x^{a+1}+y^{x-2}\:^2$
$\lim_{x\to0}\left(x^2+8\right)$
$\frac{6x^2+17x+12}{3x+4}$
$^{a^8}\:x\:^{a^{-2}}\:x\:a$
$\left(7x^{2a+1}-5m^{a+2}\right)^3$
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