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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(30) = 5.5/x // - 5.5/x
sin(30)-(5.5/x) = 0
sin(30)-5.5*x^-1 = 0
-5.5*x^-1 = -sin(30) // : -5.5
x^-1 = 0.18181818*sin(30)
-1 < 0
1/(x^1) = 0.18181818*sin(30) // * x^1
1 = 0.18181818*sin(30)*x^1 // : 0.18181818*sin(30)
5.50000006*(sin(30))^-1 = x^1
x = 5.50000006*(sin(30))^-1
x = 5.50000006*(sin(30))^-1
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