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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(34) = 3.9/x // - 3.9/x
sin(34)-(3.9/x) = 0
sin(34)-3.9*x^-1 = 0
-3.9*x^-1 = -sin(34) // : -3.9
x^-1 = 0.25641026*sin(34)
-1 < 0
1/(x^1) = 0.25641026*sin(34) // * x^1
1 = 0.25641026*sin(34)*x^1 // : 0.25641026*sin(34)
3.89999995*(sin(34))^-1 = x^1
x = 3.89999995*(sin(34))^-1
x = 3.89999995*(sin(34))^-1
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