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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
cos(65) = 60/x // - 60/x
cos(65)-(60/x) = 0
cos(65)-60*x^-1 = 0
-60*x^-1 = -cos(65) // : -60
x^-1 = cos(65)/60
-1 < 0
1/(x^1) = cos(65)/60 // * x^1
1 = (cos(65)/60)*x^1 // : cos(65)/60
60*(cos(65))^-1 = x^1
x = 60*(cos(65))^-1
x = 60*(cos(65))^-1
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