$-2x^2-12x^4+21-15x+9x^2$
$10cos\left(x-3\right)=0$
$ab\left(5a^2-3a^4b+7b^2\right)$
$\left(x+2\right)\left(x^2+6x+5\right)$
$\left(x^2-x\right)-\frac{h}{2}\left(3x-1\right)$
$\left(\ln\left(x+1\right)-\ln\left(x\right)\right)$
$\left(9x-3\right)^2$
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