If (x/y)=(9/5), find the value (x^2+y^2)/(x^2-y^2)	Choose the correct answer
A) 53/28
B) 59/11
C) 51/77
D) 41/11
E) None of them
= (x^2+y^2)/(x^2-y^2) = ( x^2 /y^2+ 1)/ ( x^2 /y^2-1) = [(9/5)^2+1] / [(9/5)^2-1]   = [(81/25)+1] / [(81/25)-1] = 53/28   53/28nswer is 53/28.
<result>A</result>
If (x/y)=(9/5), find the value (x^2+y^2)/(x^2-y^2)