xy=1 then what is (5^(x+y)^2) / (5^(x-y)^2)  Choose the correct option.
A) 2 B) 625 C) 8 D) 16 E) 32
(x+y)^2 - (x-y)^2   (x+y+x-y)(x+y-x+y)   (2x)(2y)   4xy   4   5^4 = 625   Answer 625
<result>B</result>
xy=1 then what is (5^(x+y)^2) / (5^(x-y)^2)