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F-37
k Calculs de Σ
Σ( permet d’obtenir la somme d’une expression f(x) saisie dans une
plage précise. Les calculs de Σ s’effectuent à l’aide de la formule
suivante.
Σ( f(x), a, b) = f(a) + f(a + 1) + .... + f(b)
f(x): Fonction de X (Toutes les variables à l’exception de X
sont traitées comme constantes.)
a:Point initial de la plage de calcul
b:Point final de la plage de calcul
a et b sont du entiers dans la plage de –1 × 10
10
< a < b <
1 × 10
10
.
•L’intervalle du calcul est fixé à 1.
(, d/dx(, Pol(, Rec( et Σ( ne peuvent pas être utilisés à l’intérieur
de f(x), a ou b.
Le calcul de Σ s’interrompt par une pression de A.
Appendice <#035> Σ (X + 1, 1, 5) = 20
k Conversion de coordonnées rectangulaires
en coordonnées polaires
Coordonnées Coordonnées polaires
rectangulaires (Rec) (Pol)
La conversion de coordonnées s’effectue dans les modes de calcul
COMP, STAT, MATRIX et VECTOR.
Conversion en coordonnées polaires (Pol)
Pol(X, Y) X: Spécifie la valeur X des coordonnées rectangulaires
Y: Spécifie la valeur Y des coordonnées rectangulaires
Le résultat du calcul
θ
est indiqué dans la plage de –180° <
θ
<
180°.
Le résultat du calcul
θ
est indiqué dans l’unité d’angle définie par
défaut par la calculatrice.
Le résultat du calcul r est affecté à la variable X, tandis que
θ
est
affecté à Y.
39


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