Report - De golfvergelijking in drie dimensies - Department of ...ran/golfvergelijking.pdfgeldt 1 ˇ Z ˇ ˇ jf(x)j2 dx= 1 2 a2 0 + X1 n=1 a2 n + X1 n=1 b2 n; 1 2ˇ Z ˇ ˇ jf(x)j2 dx= X1 n=1

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