xy=1 then what is (3^(x+y)^2) / (3^(x-y)^2) Choose the correct choice from the following:
A) 2
B) 4
C) 81
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   Answer 81
<result>C</result>
xy=1 then what is (3^(x+y)^2) / (3^(x-y)^2)