cos(20)=(9/x)

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Solution for cos(20)=(9/x) equation: 


D( x )

x = 0

x = 0

x = 0

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

cos(20) = 9/x // - 9/x

cos(20)-(9/x) = 0

cos(20)-9*x^-1 = 0

-9*x^-1 = -cos(20) // : -9

x^-1 = cos(20)/9

-1 < 0

1/(x^1) = cos(20)/9 // * x^1

1 = (cos(20)/9)*x^1 // : cos(20)/9

9*(cos(20))^-1 = x^1

x = 9*(cos(20))^-1

x = 9*(cos(20))^-1

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