cos(40)=x/12

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Solution for cos(40)=x/12 equation: 


x in (-oo:+oo)

cos(40) = x/12 // - x/12

cos(40)-(x/12) = 0

cos(40)-1/12*x = 0 // - cos(40)

-1/12*x = -cos(40) // : -1/12

x = -cos(40)/(-1/12)

x = 12*cos(40)

x = 12*cos(40)

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