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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
360/X = 8 // - 8
360/X-8 = 0
360*X^-1 = 8 // : 360
X^-1 = 1/45
-1 < 0
1/(X^1) = 1/45 // * X^1
1 = 1/45*X^1 // : 1/45
45 = X^1
X = 45
X = 45
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