cos(60)=4/x

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Solution for cos(60)=4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

cos(60) = 4/x // - 4/x

cos(60)-(4/x) = 0

cos(60)-4*x^-1 = 0

-4*x^-1 = -cos(60) // : -4

x^-1 = cos(60)/4

-1 < 0

1/(x^1) = cos(60)/4 // * x^1

1 = (cos(60)/4)*x^1 // : cos(60)/4

4*(cos(60))^-1 = x^1

x = 4*(cos(60))^-1

x = 4*(cos(60))^-1

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