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D( A )
A = 0
A = 0
A = 0
A in (-oo:0) U (0:+oo)
A^-1 = -1/4 // + -1/4
A^-1-(-1/4) = 0
A^-1+1/4 = 0
1*A^-1 = -1/4 // : 1
A^-1 = -1/4
-1 < 0
1/(A^1) = -1/4 // * A^1
1 = -1/4*A^1 // : -1/4
-4 = A^1
A = -4
A = -4
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