$\left(x^4\right)^{-2}$
$cos^2x=cosx+sen^2x$
$\left(7y\cdot6n\right)\left(7f\cdot nx\right)$
$6.\left(2x-1\right)-7\le-2.\left(5x-2\right)$
$-5+5-6+12+13+14-22$
$\int_1^2\left(\frac{-12x-18}{x^3-9x^2}\right)dx$
$2x^2+4x+3=0$
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