$6x^2+5x-25$
$36-x-1$
$\left(4a-9b\right)\left(2a\right)$
$\left(2x^3+6x-8\right)+\left(4x^3+9x-4\right)$
$2\cos^2x+\cos x=1$
$5^3.7^3.9$
$\lim_{x\to0}\left(xtan\left(\frac{1}{x^2}\right)\right)$
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