Use the equations in exercise to find an expression for sin

Question

Question: Use the equations in Exercise to find an expression for sin θ in terms of y and D. Simplify your answer for the case when y < d.="">

Exercise: Using the coordinates of Fig., show that

r₁ = √((y - d/2)² + D²)

r₂ = √((y + d/2)² + D²)

Fig. - Geometry of the two speaker interference experiment; the origin of the x-y coordinate system is at the midpoint of the line AE connecting the two speakers.