The resultant of two forces X and Y will be greatest when the angle between X and Y is
well, the magnitude of z=x+y is
z^2 = x^2 + y^2 + 2xy cosθ
so, for what θ is that the maximum?
That is, when is cosθ a maximum?
z^2 = x^2 + y^2 + 2xy cosθ
so, for what θ is that the maximum?
That is, when is cosθ a maximum?