Private Investigator. Because she's a detective.
It is exactly pi2. Any other way you express it would be inexact. Pi, or any number that includes pi (like pi x 2, pi + 1, pi2, etc.) are irrational numbers - they can't be expressed as a fraction,...
TT2 or TT x TT equals 9.8696044.
pi
pi minus pi is zero. Any number minus itself is zero.
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