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Blz. 14-7
periode (T) van een T-periodieke functie opslaat in de CAS-variabele PERIOD.
De functie FOURIER is beschikbaar in het submenu DERIV in het menu CALC
(„Ö).
Fourier-reeks voor een kwadratische functie
Bepaal de coëfficiënten c
0
, c
1
en c
2
voor de functie g(t) = (t-1)
2
+(t-1) met
periode T = 2.
Met de rekenmachine in de ALG-modus definiëren we eerst de functies f(t) and
g(t):
Vervolgens gaan we naar de CASDIR-subdirectory onder HOME om de
waarde van de PERIOD-variabele te veranderen: [Opmerking: niet alle
lijnen zullen zichtbaar zijn wanneer u klaar bent met de oefeningen in de
volgende afbeeldingen.]
(vasthouden) §`J @)CASDI `2K @PERIOD `
Ga terug naar de subdirectory waar u de functies f en g heeft gedefinieerd en
bereken de coëfficiënten. Stel CAS in op de Complex-modus (zie hoofdstuk 2)
alvorens deze oefeningen uit te proberen. De functie COLLECT is beschikbaar
in het menu ALG (‚×).
161


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