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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
cos(35) = 2/x // - 2/x
cos(35)-(2/x) = 0
cos(35)-2*x^-1 = 0
-2*x^-1 = -cos(35) // : -2
x^-1 = cos(35)/2
-1 < 0
1/(x^1) = cos(35)/2 // * x^1
1 = (cos(35)/2)*x^1 // : cos(35)/2
2*(cos(35))^-1 = x^1
x = 2*(cos(35))^-1
x = 2*(cos(35))^-1
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