cos(45)=x/9

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Solution for cos(45)=x/9 equation: 


x in (-oo:+oo)

cos(45) = x/9 // - x/9

cos(45)-(x/9) = 0

cos(45)-1/9*x = 0 // - cos(45)

-1/9*x = -cos(45) // : -1/9

x = -cos(45)/(-1/9)

x = 9*cos(45)

x = 9*cos(45)

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