If `sec^2 theta = 4xy/(x+y)^2` then how many pairs of x and y are there for which the condition `x!=y` is true

If sec^(2)theta=4x(y)/((x+y)^(2)) then how many pairs of x and y are there for which the condition x!=y is true

sec^2theta=4xy/(x+y)^2 is true if and only if

If "cosec"^(2) theta = (4xy)/((x+y)^(2)) , then

sec^(2)theta = 4xy/(x+y)^(2) is true if and only if

"sec"^(2) theta = (4xy)/((x + y)^(2)) is true if and only if-

sec^(2)theta = frac{4xy}{(x+y)^(2)} is true if and only if

If sec theta = (2xy)/(x^2+y^2) possible? When x and y are positive real numbers.