$\left(x^5+3x^3+6x\right)\left(x^2+2\right)$
$x^2-3x=7$
$\frac{1}{cos^2\alpha\:}+\frac{1}{sen^2\alpha\:}=\frac{1}{sen^2\alpha\:\cdot cos^2\alpha\:}$
$2\left(-\left(5-1\cdot1\right)+6\right)$
$\frac{x^4-2x^2+1}{x-1}$
$-2u-5c+3+6u-c$
$\int\left(\frac{3-3x}{1+x^2}\right)dx$
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