cos(60)=5/y

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Solution for cos(60)=5/y equation: 


D( y )

y = 0

y = 0

y = 0

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

cos(60) = 5/y // - 5/y

cos(60)-(5/y) = 0

cos(60)-5*y^-1 = 0

-5*y^-1 = -cos(60) // : -5

y^-1 = cos(60)/5

-1 < 0

1/(y^1) = cos(60)/5 // * y^1

1 = (cos(60)/5)*y^1 // : cos(60)/5

5*(cos(60))^-1 = y^1

y = 5*(cos(60))^-1

y = 5*(cos(60))^-1

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