Let S be the disk enclosed by the curve C: r(t) = (cost, cos q sin t, sin q sin t), for 0 ≤t≤2, where π is a fixed angle. By introducing the variable r, this surface can be parameterized as 2 Osos S = {(r cost, r cos q sin t, r sin q sin t): 0 ≤r≤1, 0≤t<2} with the normal vector n = (0, - Φ Use Stokes' Theorem and a surface integral to find the circulation on C of the vector field F = (-z,0,x) as a function of p. For what value of op is the circulation a maximum? - r sin ,r cos q).