00:01
Hello everyone, in this problem we are given that f vector and f vector of x, y, z to be x cube minus z x, y and y plus z square and the parabola equation is given here as z to be equal to x square plus y square and the plane equation is given to be z to be equal to x.
00:23
So now we need to evaluate this integral where c is the oriented counterclockwise.
00:28
So now in order to calculate this value we have this formula by stokes theorem so it would be equal to double integral over s curl of f vector of ds vector.
00:41
So in order to find this value we need to find this curl of f.
00:46
So curl of f will be given by the determinant of h ak of the partial derivatives of the given values with respect to x, y and z and taking determinant we have this value of curl to be 1, minus 1 and y.
01:02
So now we need to parametrize the surface so for that let us consider the r vector of x, y, z to be x, y, z and replacing the value of z in terms of x and y we can have the value of r of x, y.
01:20
Now we need to find the value of n vector which will be the cross product of the partial derivatives of r with respect to x and y.
01:28
So now taking the cross product for the values of partial derivatives of rx and ry.
01:36
So first differentiating r with respect to x so we have the value to be 1, 0, 1 -2x and again differentiating r with respect to y we have the value to be 0, 1 -2y and taking determinant we have this value.
01:52
So from here we have the values to be 2x -1, 2y and 1.
01:58
So now the curl of the curl f vector of ds of double integral can be calculated by double integral over r of curl vector curl of f vector of dot product of n vector da...