cos(64)=15/x

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Solution for cos(64)=15/x equation: 


D( x )

x = 0

x = 0

x = 0

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

cos(64) = 15/x // - 15/x

cos(64)-(15/x) = 0

cos(64)-15*x^-1 = 0

-15*x^-1 = -cos(64) // : -15

x^-1 = cos(64)/15

-1 < 0

1/(x^1) = cos(64)/15 // * x^1

1 = (cos(64)/15)*x^1 // : cos(64)/15

15*(cos(64))^-1 = x^1

x = 15*(cos(64))^-1

x = 15*(cos(64))^-1

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