00:01
Hello, let's have a look at the question.
00:03
So here we have to compute the triple integral of f x y z which is equals to z and it is in the region bounded by x which is greater than equals to 0 then we have z which is also greater than equals to 0 and y which is greater than equals to 3x and we have 9 which is greater than equals to y square plus z.
00:31
Now for better understanding let us sketch the 2d graph in yz plane that is when x is equals to 0 in yz plane.
00:41
So here let us draw the y axis and we have x axis and here we will have a circle now here this is y square plus z square which is less than equals to 9 and this is equals to 3 square.
01:00
So from here it is clear that theta ranges from 0 to 2 pi and the value for radius ranges from 0 to 3.
01:10
Now here we can write integration of f x y z dv is equals to triple integration of z dx dy and dz.
01:25
Let this be the first equation.
01:27
Now let us write the polar coordinates for cylindrical.
01:34
So here we will have that z is equals to r cos theta y is equals to r sin theta and we have z square plus y square is equals to r square.
01:47
So we can write that dy dz is equals to r dr d theta.
01:55
So from the equation 1 we can write that integration of f x y z dv is equals to triple integration of r cos theta dx then we have r dr d theta and now here we know that x limits to 0 to y equals to 3x...