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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
cos(62) = 8/x // - 8/x
cos(62)-(8/x) = 0
cos(62)-8*x^-1 = 0
-8*x^-1 = -cos(62) // : -8
x^-1 = cos(62)/8
-1 < 0
1/(x^1) = cos(62)/8 // * x^1
1 = (cos(62)/8)*x^1 // : cos(62)/8
8*(cos(62))^-1 = x^1
x = 8*(cos(62))^-1
x = 8*(cos(62))^-1
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