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傅里叶级数和收敛于: 1/2(f(x+0)+f(x-0))
g(x+2nπ) = g(x)
g(2nπ) = g(0)=1/2(f(0+0)+f(0-0))= 1/2(0+2π) = π
g((2n+1)π)=g(π) = 1/2(f(π+0)+f(π-0))= 1/2(f(-π+0)+f(π-0)) = 1/2(π+π)=π
g(x)=
x-2nπ 2nπ <x≤ (2n+2)π
π x=2nπ n∈Z
g(x+2nπ) = g(x)
g(2nπ) = g(0)=1/2(f(0+0)+f(0-0))= 1/2(0+2π) = π
g((2n+1)π)=g(π) = 1/2(f(π+0)+f(π-0))= 1/2(f(-π+0)+f(π-0)) = 1/2(π+π)=π
g(x)=
x-2nπ 2nπ <x≤ (2n+2)π
π x=2nπ n∈Z
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