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实验2 导数、微分、Taylor 公式2.1 实验目的理解导数、微分概念。理解 ...

实验2 导数、微分、Taylor 公式2.1 实验目的理解导数、微分概念。理解 ...

实验2 导数、微分、Taylor 公式2.1 实验目的理解导数、微分概念。理解 ...

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400<br />

200<br />

0.5 1.0 1.5 2.0 2.5 3.0<br />

-200<br />

-400<br />

Out[2]:= -Graphics-<br />

6.<br />

1) In[1]:=Series[x*ArcTan[x]-Log[Sqrt[1+x^2]], {x,0,6}]<br />

2 4 6<br />

x x x<br />

Out[1]= − + + Ox [ ]<br />

2 12 30<br />

In[2]:= Normal[%]<br />

2 4 6<br />

x x x<br />

Out[2]= − +<br />

2 12 30<br />

2) In[3]:= Series[1/x^2,{x,2,4}]<br />

7<br />

1 x − 2 3 1 5<br />

Out[3]= − + ( x−2) − ( x− 2) + ( x− 2) + O[ x−<br />

2]<br />

4 4 16 8 64<br />

In[4]:= Normal[%]<br />

2 3 4 5<br />

1 2−<br />

x 3 1 5<br />

Out[4]= + + ( − 2 + x) − ( − 2 + x) + ( − 2 + x)<br />

4 4 16 8 64<br />

7.<br />

In[1]:= D[x^4*y+y^a*Cos[z],x]<br />

3<br />

Out[1]= 4x y<br />

In[2]:= D[x^4*y+y^a*Cos[z],y]<br />

Out[2]= 4 −+ 1 a<br />

x + ay Cos[ z]<br />

In[3]:= D[x^4*y+y^a*Cos[z],z]<br />

a<br />

Out[3]= − y Sin[ z]<br />

2 3 4

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