$366-\:-655$
$\frac{x+3}{x};\:x=-3$
$\frac{x^4-3x^3+2x^2+2x-4}{x-2}$
$cos^2\left(u\right)\left(sec^2\left(u\right)-1\right)=sen^2\left(u\right)$
$\int_0^3\left(45xe^{-8x}\right)dx$
$4cos^2-5cosx+1=0$
$6.2x-4+x-1.2$
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