For what real values of

is

given
a)

;
b)

;
c)

,
where only non-negative real numbers are admitted for square roots?
%V0
For what real values of $x$ is $$\sqrt{x+\sqrt{2x-1}}+\sqrt{x-\sqrt{2x-1}}=A$$ given
a) $A=\sqrt{2}$;
b) $A=1$;
c) $A=2$,
where only non-negative real numbers are admitted for square roots?