Calculatrice d’intégrales
Cette calculatrice d’intégrales (pour les polynômes) trouve exactement les primitives et les intégrales définies, en montrant la règle des puissances pour chaque terme.
Résultat
Saisissez les valeurs et appuyez sur Calculer pour voir le résultat.
Formule
The reverse power rule (for n ≠ −1).
The fundamental theorem of calculus.
Comment utiliser cette calculatrice
- Type the polynomial and choose indefinite or definite.
- For a definite integral, enter the lower and upper limits.
Exemples corrigés
∫ from 0 to 2 of 3x² dx
An antiderivative of 3x² is x³.
F(2) − F(0) = 8 − 0 = 8.
Easy: an indefinite integral
Add 1 to each power and divide by the new power: x² → x³/3, and 4x → 4x²/2 = 2x².
∫(x² + 4x) dx = x³/3 + 2x² + C.
Hard: a definite integral with a negative limit
Antiderivative: F(x) = x³/3 − x² + 3x.
F(2) = 8/3 − 4 + 6 = 14/3 and F(−1) = −1/3 − 1 − 3 = −13/3.
∫ from −1 to 2 = F(2) − F(−1) = 14/3 + 13/3 = 27/3 = 9.
Erreurs fréquentes
- Forgetting + C on an indefinite integral.
- Subtracting the wrong way: a definite integral is F(upper) − F(lower).
- Sign slips at a negative limit: F(−1) = −1/3 − 1 − 3, and subtracting it adds 13/3.
Questions fréquentes
Can it do partial fraction integration?
Not directly — it integrates polynomials. For a fraction such as 1/((x − 1)(x + 2)), split it first with the Partial Fractions Calculator; each simple fraction then integrates to a logarithm.
What is + C?
Any constant differentiates to zero, so every antiderivative is defined up to a constant C.
Can it integrate sin x or eˣ?
This calculator handles polynomials. Sumzo AI can help with other functions.