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Elex
II. ∫xcos5x dx=−x5sen5x+cos5x25+C\int x \cos 5x \ dx = \frac{-x}{5} \operatorname{sen} 5x + \frac{}{}\frac{\cos 5x}{25} + C∫xcos5x dx=5−xsen5x+25cos5x+C III. ∫(x2+2x)cosx dx=(x2+2x)senx+C\int (x^2 + 2x) \cos x \ dx = (x^2 + 2x) \operatorname{sen} x + C∫(x2+2x)cosx dx=(x2+2x)senx+C
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