def ithOfNPointsOnCircleX(i,n,r):
    """ 
    return x coordinate of ith value of n points on circle of radius r
    points are numbered from 0 through n-1, spread counterclockwise around circle
    point 0 is at angle 0, as of on a unit circle, i.e. at point (0,r)
    """

    # Hints:
    #   Basic formula is x = r cos (theta)
    #   But you need to use Python notation, and the math module
    #   The theta angle is in radians, and is some "portion" of 2 pi  
    
    return "stub"