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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
46/57.5 = 360/q // - 360/q
46/57.5-(360/q) = 0
46/57.5-360*q^-1 = 0
-360*q^-1 = -0.8 // : -360
q^-1 = 0.00222222
-1 < 0
1/(q^1) = 0.00222222 // * q^1
1 = 0.00222222*q^1 // : 0.00222222
450.00045 = q^1
q = 450.00045
q = 450.00045
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