cos(90)=12/x

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Solution for cos(90)=12/x equation: 


D( x )

x = 0

x = 0

x = 0

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

cos(90) = 12/x // - 12/x

cos(90)-(12/x) = 0

cos(90)-12*x^-1 = 0

-12*x^-1 = -cos(90) // : -12

x^-1 = cos(90)/12

-1 < 0

1/(x^1) = cos(90)/12 // * x^1

1 = (cos(90)/12)*x^1 // : cos(90)/12

12*(cos(90))^-1 = x^1

x = 12*(cos(90))^-1

x = 12*(cos(90))^-1

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