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Integrala din cos(3x) =?

Răspuns :

Folosim formula:
   
[tex] \int { cos(\alpha x)} \, dx = \frac{sin (\alpha x)}{ \alpha} \\ \\ \text{Rezolvare:} \\ \\ \int{cos(3x)\,} dx = \frac{sin (3 x)}{3}+C[/tex]