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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
cos(22) = 3/x // - 3/x
cos(22)-(3/x) = 0
cos(22)-3*x^-1 = 0
-3*x^-1 = -cos(22) // : -3
x^-1 = cos(22)/3
-1 < 0
1/(x^1) = cos(22)/3 // * x^1
1 = (cos(22)/3)*x^1 // : cos(22)/3
3*(cos(22))^-1 = x^1
x = 3*(cos(22))^-1
x = 3*(cos(22))^-1
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