Derivada de una función - TEC-Digital
Derivada de una función - TEC-Digital
Derivada de una función - TEC-Digital
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√ 1<br />
2. Dx log2 x = √x log2 e ·<br />
3. Dx log 5<br />
= 1<br />
x+1<br />
x 2 +3<br />
= 3 − 2x − x2<br />
<br />
x + 1<br />
x2 <br />
+ 3<br />
log 5 e ·<br />
(x + 1)(x 2 + 3)<br />
1<br />
2 √ x = log2 e<br />
, x > 0<br />
2x<br />
x 2 + 3<br />
1 − (x + 1)(2x) · (x2 + 3) 2<br />
log 5 e, x > −1<br />
En particular si la base <strong>de</strong> los logaritmos es e entonces el log e x se <strong>de</strong>nota por ln x, y:<br />
1. Dx ln x = 1<br />
x loge e = 1 1<br />
· 1 =<br />
x x , es <strong>de</strong>cir Dx ln x = 1<br />
x<br />
2. Si g(x) es <strong>una</strong> <strong>función</strong> <strong>de</strong>rivable con g(x) = 0 entonces:<br />
Dx ln |g(x)| = 1<br />
g(x) Dx(g(x))<br />
Ejemplo 3<br />
1. Dx ln 5x = 1<br />
5x Dx(5x) = 1 1<br />
· 5 =<br />
5x x<br />
2. Dx ln( √ x + 1 + x) =<br />
=<br />
1<br />
√ x + 1 + x Dx( √ x + 1 + x)<br />
<br />
1<br />
1<br />
√ ·<br />
x + 1 + x 2 √ <br />
+ 1 , x > −1.<br />
x + 1<br />
3. Dx ln 2 x = Dx[ln x] 2 = 2[ln x] · Dx ln x = 2 ln x · 1 2 ln x<br />
=<br />
x x<br />
4. Dx ln 4 (x 2 + 5) = Dx[ln(x 2 + 5)] 4<br />
= 4[ln(x 2 + 5)] 3 ·<br />
= 8x · ln3 (x 2 + 5)<br />
x 2 + 5<br />
5. Dx[ln(3x + 1) − 4x] =<br />
<br />
2<br />
6. Dx<br />
ln(x + 1)<br />
−1<br />
= Dx 2[ln(x + 1)] <br />
= −2[ln(x + 1)] −2 ·<br />
1<br />
x 2 + 5 (2x)<br />
x ∈ R.<br />
3<br />
3x + 1<br />
1<br />
x + 1<br />
−12x − 1 −1<br />
− 4 = , x ><br />
3x + 1 3 .<br />
<strong>Derivada</strong> <strong>de</strong> la <strong>función</strong> logarítmica 37