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D( F )
33.8^2 = 0
33.8^2 = 0
33.8^2 = 0
33.8^2 = 0
F belongs to the empty set
F in (-oo:+oo)
24.5^2 = F/(33.8^2) // - F/(33.8^2)
24.5^2-(F/(33.8^2)) = 0
24.5^2-33.8^-2*F = 0 // - 24.5^2
-33.8^-2*F = -24.5^2 // : -33.8^-2
F = (-24.5^2)/(-33.8^-2)
F = (24.5^2)/(33.8^-2)
F = (24.5^2)/(33.8^-2)
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