06.08.2013 Views

Web skærmformat. - Aarhus Universitet

Web skærmformat. - Aarhus Universitet

Web skærmformat. - Aarhus Universitet

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

VIII. Appendiks – 1. Polære koordinater og komplekse tal 506<br />

For et kompleks tal z = a + bi er brøken<br />

z z ¯w z ¯w<br />

= =<br />

w w ¯w |w| 2<br />

a + bi (a + bi)(c − di)<br />

=<br />

c + di c2 + d2 1.12. Kompleks brøk ☞ [S] Appendix I Complex numbers<br />

Eksempel 2<br />

−1 + 3i<br />

Angiv på formen a + bi.<br />

2 + 5i<br />

−1 + 3i<br />

2 + 5i<br />

(−1 + 3i)(2 + 5i)<br />

=<br />

(2 + 5i)(2 + 5i)<br />

= (−1 + 3i)(2 − 5i)<br />

(2 + 5i)(2 − 5i)<br />

= (−2 + 15) + (5 + 6)i<br />

2 2 + 5 2<br />

= 13 11<br />

+<br />

29 29 i<br />

1.13. Test komplekse tal ☞ [S] Appendix I Complex numbers

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!