$2x+3x^2;\:x=3$
$\int_1^{\infty}\left(\frac{x^2}{x^3+2}\right)dx$
$5a\:-\:5a$
$-6\left(6w-4u-4\right)$
$2a^2+2b^2+4$
$\:\frac{\left(a^4^n-\:b^2^n\right)}{\left(a^2^n\:+\:b^n\right)}$
$\frac{3x+1}{x^2+4x+3}$
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