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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

1 answer

A false
B true
C true, if you allow complex values. Otherwise, it has no real values at all.

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