`sec^(2)theta==(4ab)/((a+b)^(2)),` where a, b `inR` is true if and olny if

sec theta=(a^(2)+b^(2))/(a^(2)-b^(2)), where a, binR, gives real balues of theta if and only if

sec theta=(a^(2)+b^(2))/(a^(2)-b^(2)), where a, binR, gives real balues of theta if and only if

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

The equation (a+b)^(2)=4ab sin^(2)theta is true if and only if

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

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

Prove that sin^(2) theta = ((a+b)^(2))/(4ab) is not possible for any real theta where a, b in R and |a|!= |b| .