cos(40)=12/x

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Solution for cos(40)=12/x equation: 


D( x )

x = 0

x = 0

x = 0

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

cos(40) = 12/x // - 12/x

cos(40)-(12/x) = 0

cos(40)-12*x^-1 = 0

-12*x^-1 = -cos(40) // : -12

x^-1 = cos(40)/12

-1 < 0

1/(x^1) = cos(40)/12 // * x^1

1 = (cos(40)/12)*x^1 // : cos(40)/12

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

x = 12*(cos(40))^-1

x = 12*(cos(40))^-1

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