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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(55) = 25/x // - 25/x
sin(55)-(25/x) = 0
sin(55)-25*x^-1 = 0
-25*x^-1 = -sin(55) // : -25
x^-1 = sin(55)/25
-1 < 0
1/(x^1) = sin(55)/25 // * x^1
1 = (sin(55)/25)*x^1 // : sin(55)/25
25*(sin(55))^-1 = x^1
x = 25*(sin(55))^-1
x = 25*(sin(55))^-1
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