cos(65)=4.5/x

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Solution for cos(65)=4.5/x equation: 


D( x )

x = 0

x = 0

x = 0

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

cos(65) = 4.5/x // - 4.5/x

cos(65)-(4.5/x) = 0

cos(65)-4.5*x^-1 = 0

-4.5*x^-1 = -cos(65) // : -4.5

x^-1 = 0.22222222*cos(65)

-1 < 0

1/(x^1) = 0.22222222*cos(65) // * x^1

1 = 0.22222222*cos(65)*x^1 // : 0.22222222*cos(65)

4.50000005*(cos(65))^-1 = x^1

x = 4.50000005*(cos(65))^-1

x = 4.50000005*(cos(65))^-1

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