Integrals: Is my math correct thus far?
http://prntscr.com/3ol9jj

I am comparing with the solution, and it wants a negative infront of my last cos(n pi x)/(n pi)^2.

Question

Integrals: Is my math correct thus far?
http://prntscr.com/3ol9jj

I am comparing with the solution, and it wants a negative infront of my last cos(n pi x)/(n pi)^2.

hartnn · Answer

why do u say there should be negative ? 
your work seems to be correct so far

hartnn · Answer

whats your final answer ?

anonymous · Answer

Thank you - the wrong "solutions" are confusing me when I compare to check. It is not difficult to do them, but if I become uncertain, everything goes to hell and back. :)

anonymous · Answer

The entire "solution": http://prntscr.com/3olctb

hartnn · Answer

your function is from -1 to 1
but you used the formula for 0 to 1 only ??

don't you have a formula which does not have lower limit = 0 ??

which goes from c to c+2l ?

hartnn · Answer

you sure you have solved it correctly ?

anonymous · Answer

No, the formula it is correct. 
The function has symmetry in Y-axis, so the value from 0 to 1 is the same as -1 to 1. That is why we have 2 in front of the integral in a0 and an.

If it wasn't symmetrical in the y-axis, I would have to use a different formula.

anonymous · Answer

By the way, that is not "my" math - that is the solution I have been provided (that is wrong in a few places)