xy=1 then what is (3^(x+y)^2) / (3^(x-y)^2)	Choose the correct answer.
A) 81 B) 4 C) 8 D) 16 E) 32
(x+y)^2 - (x-y)^2   (x+y+x-y)(x+y-x+y)   (2x)(2y)   4xy   4   3^4 = 81   81nswer 81
<result>A</result>
xy=1 then what is (3^(x+y)^2) / (3^(x-y)^2)