$10x+1.\frac{x^2-1}{x+3}$
$5xy+\left(-2xy-3xy\right)$
$\lim_{x\to0}\left(\frac{e^x-e^{-x}-2x}{1-sen\:x}\right)$
$4+2-b$
$\int e^xcos\left(8x\right)dx$
$x^4-2x^2-48$
$f\left(x\right)=\:4x^3-32$
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