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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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