Solve equation in interval

14 vues (au cours des 30 derniers jours)
Veronika Puskelova
Veronika Puskelova le 29 Nov 2020
f = x^2*exp(-x) % at interval x is <-1, 1>
fder = diff(f,x,1)
i need solution for fder in interval <-1 1>, but command solve(fder, [-1 1]) not work pls help

Réponse acceptée

Setsuna Yuuki.
Setsuna Yuuki. le 29 Nov 2020
Modifié(e) : Setsuna Yuuki. le 29 Nov 2020
You can try:
syms x
f = x^2*exp(-x)
fder = diff(f,x,1)
vpasolve(fder,[-1 1]) %change solve

Plus de réponses (1)

Walter Roberson
Walter Roberson le 29 Nov 2020
syms x
solve([diff(x^2*exp(-x)), x <= 1, x >= -1])
ans = 
0

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