$7a^2-14a-21$
$\frac{\tan\left(3x\right)}{\cos^3\left(3x\right)}$
$a^2b^2a^2$
$\lim_{x\to0}\:x^2\left(2x^6-3w^4\right)^{-1}$
$\log_a\left(125\right)$
$\left(2x+1\right)\left(4x^2-2x+1\right)$
$\int sen^2ocos^3odo$
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