Question:`(a^2 + 9y^2)/(a^2 - 9y^2) - (a - 3y)/(a + 3y)`= কত? 

A `(3ay)/(a^2 - 9y)` 

B `(ay)/(a^2 - 9y^2)` 

C `(6a^2y^2)/(a^2 - 9y)` 

D `(6ay)/(a^2 - 9y^2)` 

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