$\left(2x^4-3x^3+6x^2-5x+4\right)\cdot\left(3x^3-4x^2+5x-2\right)$
$2\cos^2\left(x\right)+2\cos\left(x\right)\cos\left(y\right)$
$12-9-2-o$
$\int\frac{\left(y-2\right)}{\left(y+3\right)}dy$
$m-5-5m+4$
$5b+b^4z-25b^3w$
$\left(3z-5\right)\left(7z+1\right)$
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