X = All Real Numbers
or
-infinity (is less than) x (is less than) infinity
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D = {x [element of reals]}R = {y [element of reals]|y >= 4}
(X2) (X2) = X4 x squared multiplied by x squared is x raised to the 4th power.
Sin squared, cos squared...you removed the x in the equation.
If you mean a2 x a2... the answer is a4
X = √63