sage: var('a b')
(a, b)
sage: assume(a, 'real')
sage: assume(b, 'real')
sage: bool( sqrt((a+b)^2) == sqrt(a^2) + sqrt(b^2) )
True
sage:bool( (sqrt((a+b)^2) == sqrt(a^2) + sqrt(b^2)).subs(a=1,b=-1) )
False
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