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D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

cos(40) = 4/x / - 4/x

cos(40)-(4/x) = 0

cos(40)-4*x^-1 = 0

-4*x^-1 = -cos(40) / : -4

x^-1 = cos(40)/4

-1 < 0

1/(x^1) = cos(40)/4 / * x^1

1 = (cos(40)/4)*x^1 / : cos(40)/4

4*(cos(40))^-1 = x^1

x = 4*(cos(40))^-1

x = 4*(cos(40))^-1

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