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9y^2-6b^2y -( a^4-b^4) =0
by using shri dharacharya formula
minus b plus minus √ b square minus 4 ac divided by 2a
put the value in formula
+6b^2 plus minus √36 b^2 +36 a^2-36 b^2/18
6b^2 plus minus 6a^2/18
b^2 plus minus a^2 /3
hence, a part is the correct answer of this ques
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