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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
sin(67) = 13/x // - 13/x
sin(67)-(13/x) = 0
sin(67)-13*x^-1 = 0
-13*x^-1 = -sin(67) // : -13
x^-1 = sin(67)/13
-1 < 0
1/(x^1) = sin(67)/13 // * x^1
1 = (sin(67)/13)*x^1 // : sin(67)/13
13*(sin(67))^-1 = x^1
x = 13*(sin(67))^-1
x = 13*(sin(67))^-1
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