Answer:
1) 3|x|=[0; infinity). there is no infinity sign lol
2) 3|x|= (0; infinity)
We have some couples of angles that are equal
Let
. Then

lies in the second quadrant, so

So we have

and the fourth roots of
are

where
. In particular, they are




Answer: b
Step-by-step explanation: edge 2020
The equation in spherical coordinates will be a constant, as we are describing a spherical shell.
r(φ, θ) = 8 units.
<h3>
How to rewrite the equation in spherical coordinates?</h3>
The equation:
x^2 + y^2 + z^2 = R^2
Defines a sphere of radius R.
Then the equation:
x^2 + y^2 + z^2 = 64
Defines a sphere of radius √64 = 8.
Then we will have that the radius is a constant for any given angle, then we can write r, the radius, as a constant function of θ and φ, the equation will be:
r(φ, θ) = 8 units.
If you want to learn more about spheres, you can read:
brainly.com/question/10171109