The result `sqrt(x)^2' is simplified back to x by the
Calculator, but `sqrt(x^2)' is not. (Consider what happens
if x = -4.) If x is real, this formula could be
simplified to `abs(x)', but for general complex arguments even
that is not safe. (See section 7.6 Declarations, for a way to tell Calc
that x is known to be real.)
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