draw a spiral as of a 3D plot where x and y are dependant on z which is the rotation angle varying form 0 to 10*pi (5 complete revolutions). The x and y values are mapped as sin(0) and cos(0) the classic means of describing a circle the spiral effect is accomplished by plotting 0 on the z axis . use the step increase 0 to be 0.1. turn the grid on. show matlab code and figure