Fourierrows:
http://prntscr.com/3ol52k

Am I wrong, or is the "solution" wrong? If I recall, whatever you do, when using the core rule, everything inside the sin/cos should not change, right?

Help much appreciated :)

Question

Fourierrows:
http://prntscr.com/3ol52k

Am I wrong, or is the "solution" wrong? If I recall, whatever you do, when using the core rule, everything inside the sin/cos should not change, right?

Help much appreciated :)

hartnn · Answer

yes thats a typing mistake probably

hartnn · Answer

$\int \cos n\pi x dx = \dfrac{\sin n\pi x}{n\pi } +c$

anonymous · Answer

$$f(x) = \frac{ 1 }{ n \pi } * \sin(n \pi x)$$

$$f'(x) = \frac{ 1 }{ n \pi } * \cos (n \pi x) * n \pi$$

anonymous · Answer

Thanks for the second opinion, I knew something had to be off with that "solution"..

hartnn · Answer

welcome ^_^