掌握高级导数技巧:AM课程中的高阶导数法则及常见基本函数的高阶导数公式详解
...
d
n
d
x
n
x
α
=
x
α
−
n
∏
k
=
0
n
−
1
(
α
−
k
)
\frac{{\rm{d}}^n}{{\rm{d}}x^n}x^{\alpha}=x^{\alpha-n}\prod_{k=0}^{n-1}(\alpha-k)
dxndnxα=xα−n∏k=0n−1(α−k)
d
n
d
x
n
1
x
=
(
−
1
)
n
n
!
x
n
+
1
\frac{{\rm{d}}^n}{{\rm{d}}x^n}\frac{1}{x}=(-1)^{n}\frac{n!}{x^{n+1}}
dxndnx1=(−1)nxn+1n!
d
n
d
x
n
ln
x
=
(
−
1
)
n
−
1
(
n
−
1
)
!
x
n
\frac{{\rm{d}}^n}{{\rm{d}}x^n}\ln x=(-1)^{n-1}\frac{(n-1)!}{x^n}
dxndnlnx=(−1)n−1xn(n−1)!;
d
n
d
x
n
ln
(
1
+
x
)
\frac{{\rm{d}}^n}{{\rm{d}}x^n}\ln(1+x)
dxndnln(1+x)=
(
−
1
)
n
−
1
(
n
−
1
)
!
(
1
+
x
)
n
(-1)^{n-1}\frac{(n-1)!}{(1+x)^{n}}
(−1)n−1(1+x)n(n−1)!
d
n
d
x
n
e
x
=
e
x
\frac{{\rm{d}}^n}{{\rm{d}}x^n}e^x=e^x
dxndnex=ex
d
n
d
x
n
a
x
=
a
x
⋅
ln
n
a
\frac{{\rm{d}}^n}{{\rm{d}}x^n} a^x=a^x \cdot \ln^n a
dxndnax=ax⋅lnna
(
a
>
0
)
(a>0)
(a>0)
d
n
d
x
n
sin
(
k
x
+
b
)
=
k
n
sin
(
k
x
+
b
+
n
π
2
)
\frac{{\rm{d}}^n}{{\rm{d}}x^n}\sin \left(kx+b\right)=k^n\sin \left(kx+b+\frac{n\pi}{2}\right)
dxndnsin(kx+b)=knsin(kx+b+2nπ)
d
n
d
x
n
cos
(
k
x
+
b
)
=
k
n
cos
(
k
x
+
b
+
n
π
2
)
\frac{{\rm{d}}^n}{{\rm{d}}x^n}\cos \left(kx+b\right)=k^n\cos \left(kx+b+\frac{n\pi}{2}\right)
dxndncos(kx+b)=kncos(kx+b+2nπ)