Which of the following is/are true
A. (2/a-b) (b-a/2)=-1
B.If x=-1/2 and y=-2 then -x^2-4x/y+y^2=2 3/4
C.√1-x /√x-1 is defined for all x€R,x is not equal to 1
A false
B true
C true, if you allow complex values. Otherwise, it has no real values at all.