$\left(x^3\right)\left(2x+1\right)$
$100a^2-4b^2$
$\lim_{f\to-1}\left(f^2-x^2\right)$
$\left(3x+5yz\right)^2$
$2cos^2x=sen\:x-1\:$
$9x^2-42x\:+21$
$3-\left(2-4-3\right)$
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