$3n^2+4n$
$\frac{x^4-x^3+5x^2-5}{x^2+1}$
$8sin^2x\:+sinxcosx\:=\:2$
$55-60-58+6-16$
$5abc\cdot\left(4a^6b^3\right)^2$
$\sqrt{x}^2-4$
$a^2-4a-4$
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