calculs 3

Note: please write down the Answer by hand on paper and also write each answer with the number of the questions

11. (a) Change the point (4V3, -4, 6) form cartesian coordinates to cylindrical coordinates. (b) Change the point (1, 5, 1) from cylindrical coordinates to cartesian coordinates. (c) Express the surface x2 + y2 + 422 = 10 in cylindrical coordinates.12. Evaluate each of the following integrals. (a ) (23 + y x) dady, where D is the region under the graph of y - x from x - 0 to x - 2. (b ) / sec(x2 + y?) dxdy, where D is the region defined by x2 + y?