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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
33/360 = 132/x // - 132/x
33/360-(132/x) = 0
33/360-132*x^-1 = 0
-132*x^-1 = -11/120 // : -132
x^-1 = 1/1440
-1 < 0
1/(x^1) = 1/1440 // * x^1
1 = 1/1440*x^1 // : 1/1440
1440 = x^1
x = 1440
x = 1440
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