cos(45)=4/x

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Solution for cos(45)=4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

cos(45) = 4/x // - 4/x

cos(45)-(4/x) = 0

cos(45)-4*x^-1 = 0

-4*x^-1 = -cos(45) // : -4

x^-1 = cos(45)/4

-1 < 0

1/(x^1) = cos(45)/4 // * x^1

1 = (cos(45)/4)*x^1 // : cos(45)/4

4*(cos(45))^-1 = x^1

x = 4*(cos(45))^-1

x = 4*(cos(45))^-1

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