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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(13) = 3.5/x // - 3.5/x
sin(13)-(3.5/x) = 0
sin(13)-3.5*x^-1 = 0
-3.5*x^-1 = -sin(13) // : -3.5
x^-1 = 0.28571429*sin(13)
-1 < 0
1/(x^1) = 0.28571429*sin(13) // * x^1
1 = 0.28571429*sin(13)*x^1 // : 0.28571429*sin(13)
3.49999995*(sin(13))^-1 = x^1
x = 3.49999995*(sin(13))^-1
x = 3.49999995*(sin(13))^-1
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