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Anshum Sharma Best Answer
Consider 2 circles with radii A & 2A and particles moving on them with constant angular velocity ω. Choose x axis to be horizontal on which the projection of the particles are to be taken. When the projection of the first particle is at a distance A/2 from origin, it is at an angle 45° in the first quadrant. whereas the second particle is at an angle 180°. i.e the phase difference is 135°