Which bond angle θ would result in the maximum dipole moment for the triatomic molecule YXY ?

The dipole moment of two dipoles inclined at an angle θ is given by the equation μ=X2+Y2+2XY cosθcos 900=0. Since the angle increases from 90 to 180, the value of cosθ becomes more and more - ve and hence resultant decreases. Thus, dipole moment is maximum whenθ=900.