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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
cos(34) = 25/x // - 25/x
cos(34)-(25/x) = 0
cos(34)-25*x^-1 = 0
-25*x^-1 = -cos(34) // : -25
x^-1 = cos(34)/25
-1 < 0
1/(x^1) = cos(34)/25 // * x^1
1 = (cos(34)/25)*x^1 // : cos(34)/25
25*(cos(34))^-1 = x^1
x = 25*(cos(34))^-1
x = 25*(cos(34))^-1
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