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(- 2) = -2 OK
(- -2) = 2 OK
(- (rational 2 3)) = -2/3 OK
(- (rational -2 3)) = 2/3 OK
(- 2.5) = -2.5 OK
(- -2.5) = 2.5 OK
(- (complex 1.0 -2.0)) = -1.0+2.0i OK
(- (complex -1.0 2.0)) = 1.0-2.0i OK
(abs 2) = 2 OK
(abs -2) = 2 OK
(abs (rational 2 3)) = 2/3 OK
(abs (rational -2 3)) = 2/3 OK
(abs 2.5) = 2.5 OK
(abs -2.5) = 2.5 OK
(abs (complex 1.0 -2.0)) = 2.23606797749979 OK
(abs (complex -1.0 2.0)) = 2.23606797749979 OK
(conj 2) = 2 OK
(conj (rational 2 3)) = 2/3 OK
(conj 2.5) = 2.5 OK
(conj (complex 1.0 -2.0)) = 1.0+2.0i OK
(conj (complex -1.0 2.0)) = -1.0-2.0i OK
(square 2) = 4 OK
(square -2) = 4 OK
(square (rational 2 3)) = 4/9 OK
(square (rational -2 3)) = 4/9 OK
(square 2.5) = 6.25 OK
(square -2.5) = 6.25 OK
(square (complex 1.0 -2.0)) = -3.0-4.0i OK
(square (complex -1.0 2.0)) = -3.0-4.0i OK
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