MATHEMATICA里面定义傅里叶级数,几个问题不懂n1 = 100; a1 = Table[1/\[Pi] NIntegrate[f[x] Cos[i x],{x,-\[Pi],\[Pi]}],{i,0,n1}]; b1 = Table[1/\[Pi] NIntegrate[f[x] Sin[i x],{x,-\[Pi],\[Pi]}],{i,n1}]; Clear[x]; g1 = a[[1]]/2 + Sum[a1[[i + 1
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