$x^2+3x^3-2x+5x^2-6x^3-3x-1$
$sinxtanx+secx\left(1-2sin^2x\right)$
$7a^2-3a^2+6a-11$
$a^2+2ab+b^2-a^2-ab$
$3\log x=\log125$
$\left(r-3q^3\right)^2$
$12x^3+12x^2$
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