Question

Determine the constant b such that
A
=
(
b
x
+
4
y
2
z
)
i
+
(
x
3
s
i
n
z
−
3
y
)
j
–
(
e
x
+
4
c
o
s
x
2
y
)
k
A=(bx+4y2z)i+(x3sinz−3y)j–(ex+4cosx2y)k
is a solenoidal