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Web skærmformat. - Aarhus Universitet

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VIII. Appendiks – 1. Polære koordinater og komplekse tal 501<br />

Im<br />

bi<br />

i<br />

0 1<br />

1.4. Komplekse plan ☞ [S] Appendix I Complex numbers<br />

Definition - fortsat<br />

x-aksen kaldes den reelle akse og y-aksen kaldes den imaginœre akse.<br />

Normen<br />

kaldes modulus eller absolut værdi.<br />

Eksempel<br />

a<br />

a+bi<br />

Re<br />

|a + bi| = a 2 + b 2 = |(a,b)|<br />

|3 − 4i| = 3 2 + 4 2 = √ 25 = 5

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