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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x = cos(45) // - cos(45)
14/x-cos(45) = 0
14*x^-1 = cos(45) // : 14
x^-1 = cos(45)/14
-1 < 0
1/(x^1) = cos(45)/14 // * x^1
1 = (cos(45)/14)*x^1 // : cos(45)/14
14*(cos(45))^-1 = x^1
x = 14*(cos(45))^-1
x = 14*(cos(45))^-1
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