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Jun
11
comment Is this fourier even?
so is it safe to say $b_n=0$ and for $a_n$ calculate $2 \int_0^{pi}f(x)dx$ ?
Jun
11
comment Is this fourier even?
@M.Vinay I know that b_n is zero for even function but because this isnt even at x=0 but $f(x)=f(2π−x)$ me an other students had trouble with that.
Jun
11
comment Is this fourier even?
the question is if we can conclude that $b_n =0$ without calculating it. and since domain isnt at -pi,pi how can we tell
Jun
11
comment Is this fourier even?
fourier $b_n$ == 0 too?
Jun
11
accepted Local max/min of this
Jun
11
asked Is this fourier even?
Jun
10
comment How is $2\sum_{n=2}^{\infty}\frac{1}{(n-1)(n+1)}=\frac{6}{4}$ calculated?
i cant get that result
Jun
10
asked How is $2\sum_{n=2}^{\infty}\frac{1}{(n-1)(n+1)}=\frac{6}{4}$ calculated?
Jun
9
revised Local max/min of this
deleted 1 character in body
Jun
7
comment Local max/min of this
maybe there is something wrong with problem then. using lagrange multipliers I can find x=y and $x=\sqrt{2}/2$ but then I cant find λ. For λ=0 I get Det =0 meaning no solution
Jun
7
comment Local max/min of this
it makes sense and helps to verify. But what I was looking was Lagrange , Lagarde method.Maybe it isnt possible ?
Jun
7
comment Local max/min of this
yep but seems hard to solve the system
Jun
7
comment Local max/min of this
I have a limitation (dont know how it is called) $x^2 + y^2 -1=0$ I know the theory but at this example seems difficult for me to apply it.
Jun
7
comment Local max/min of this
i have to solve without that
Jun
7
asked Local max/min of this
Jun
7
accepted Improper integral comparison test
Jun
6
comment Improper integral comparison test
Where can I find texts about these tricks ?
Jun
6
comment Improper integral comparison test
if bottom $x^5$ was like $10x^5$ would it matter too ?
Jun
6
comment Improper integral comparison test
they are the same with the first. Integral from 1 to infinity
Jun
6
comment Improper integral comparison test
thanks didnt notice