Report - kuweb.math.ku.dk/noter/filer/matintro-04.pdf · –15 –10 –5 0 5 10 15 20 z –2–1 123456 y –15 –10 –5 0 5 10 15 20 z –2–1 123456. –15 –10 –5 0 5 10 15 20 z

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