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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
cos(37) = 11/x // - 11/x
cos(37)-(11/x) = 0
cos(37)-11*x^-1 = 0
-11*x^-1 = -cos(37) // : -11
x^-1 = cos(37)/11
-1 < 0
1/(x^1) = cos(37)/11 // * x^1
1 = (cos(37)/11)*x^1 // : cos(37)/11
11*(cos(37))^-1 = x^1
x = 11*(cos(37))^-1
x = 11*(cos(37))^-1
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