Plot
-
9πt
10000

-
9πt
5000

//Re,{t,0,1000}
Out[]=
200
400
600
800
1000
-1.0
-0.5
0.5
1.0
In[]:=
-
9πt
10000

-
9πt
5000

/.t1.
Out[]=
1.+0.
In[]:=
-
9πt
10000

-
9πt
5000

/.t600.
Out[]=
-1.+1.249×
-16
10
