When expressing the fourth roots w k of a complex number generated by w k = r n cos θ + 360 ° k n + i sin θ + 360 ° k n for k = 0 , 1 , 2 , … , n − 1 by how many degrees will consecutive roots differ? In general, given an integer n > 2 , by how many degrees will consecutive n th roots differ?
When expressing the fourth roots w k of a complex number generated by w k = r n cos θ + 360 ° k n + i sin θ + 360 ° k n for k = 0 , 1 , 2 , … , n − 1 by how many degrees will consecutive roots differ? In general, given an integer n > 2 , by how many degrees will consecutive n th roots differ?
Solution Summary: The author calculates the degrees by which the consecutive roots differ for the fourth roots of a complex number generated by w_k.
When expressing the fourth roots
w
k
of a complex number generated by
w
k
=
r
n
cos
θ
+
360
°
k
n
+
i
sin
θ
+
360
°
k
n
for
k
=
0
,
1
,
2
,
…
,
n
−
1
by how many degrees will consecutive roots differ? In general, given an integer
n
>
2
, by how many degrees will consecutive nth roots differ?
Combination of a real number and an imaginary number. They are numbers of the form a + b , where a and b are real numbers and i is an imaginary unit. Complex numbers are an extended idea of one-dimensional number line to two-dimensional complex plane.
3.1 Limits
1. If lim f(x)=-6 and lim f(x)=5, then lim f(x). Explain your choice.
x+3°
x+3*
x+3
(a) Is 5
(c) Does not exist
(b) is 6
(d) is infinite
1 pts
Let F and G be vector fields such that ▼ × F(0, 0, 0) = (0.76, -9.78, 3.29), G(0, 0, 0) = (−3.99, 6.15, 2.94), and
G is irrotational. Then sin(5V (F × G)) at (0, 0, 0) is
Question 1
-0.246
0.072
-0.934
0.478
-0.914
-0.855
0.710
0.262
.
2. Answer the following questions.
(A) [50%] Given the vector field F(x, y, z) = (x²y, e", yz²), verify the differential identity
Vx (VF) V(V •F) - V²F
(B) [50%] Remark. You are confined to use the differential identities.
Let u and v be scalar fields, and F be a vector field given by
F = (Vu) x (Vv)
(i) Show that F is solenoidal (or incompressible).
(ii) Show that
G =
(uvv – vVu)
is a vector potential for F.
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