$\frac{x+1}{x^2-1}$
$\left(2r+6y\right)$
$25a^2c^2\:+\:20acd\:+\:4d^2$
$4x^2-12x+90$
$100m^2n^4-\frac{x^8}{16}$
$sin\left(a\right)=-0.78$
$\left(3g\right)^3$
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