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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(34) = 9/x // - 9/x
sin(34)-(9/x) = 0
sin(34)-9*x^-1 = 0
-9*x^-1 = -sin(34) // : -9
x^-1 = sin(34)/9
-1 < 0
1/(x^1) = sin(34)/9 // * x^1
1 = (sin(34)/9)*x^1 // : sin(34)/9
9*(sin(34))^-1 = x^1
x = 9*(sin(34))^-1
x = 9*(sin(34))^-1
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