xy=1 then what is (4^(x+y)^2) / (4^(x-y)^2)	Choose one
A) 2
B) 4
C) 8
D) 256
E) 32
(x+y)^2 - (x-y)^2   (x+y+x-y)(x+y-x+y)   (2x)(2y)   4xy   4   4^4 = 256   Answer 256
<result>D</result>
xy=1 then what is (4^(x+y)^2) / (4^(x-y)^2)