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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
cos(60) = 3/x // - 3/x
cos(60)-(3/x) = 0
cos(60)-3*x^-1 = 0
-3*x^-1 = -cos(60) // : -3
x^-1 = cos(60)/3
-1 < 0
1/(x^1) = cos(60)/3 // * x^1
1 = (cos(60)/3)*x^1 // : cos(60)/3
3*(cos(60))^-1 = x^1
x = 3*(cos(60))^-1
x = 3*(cos(60))^-1
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