f : [-Ą, Ą] R
f(x) = |x|
f(x) = 169 cos(3x)
f : [-Ą, Ą] R
f(x) = sin(2x)
f(x) = 169 cos(3x)
f(x) = 1
+"
n
(-1)"(sin nx+cos nx)
n9+2n2+1
n=1
+"
cos nx
n!+n10
n=1
a > 0
+"
2
f(x, t) = cne-n a2t sin(nx), t e" 0, x " R,
n=1
cn C2 Ć : [0, Ą] R
f
ft fxx