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New Problem Variation
Give an example of a function
which is orthogonal to
2·cos(3·
x
)−2·sin(6·
x
)
with respect to the scalar product
<
g
|
h
> =
1
π
⌠
⌡
π
−π
dx
g
(
x
) ·
h
(
x
)
whose norm is 1.
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