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sin^2((180-x)/(4k+2))-(1-cos(x))/72=0 equation

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Numerical solution:

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The solution

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   2/180 - x\   1 - cos(x)    
sin |-------| - ---------- = 0
    \4*k + 2/       72        
$$- \frac{1 - \cos{\left(x \right)}}{72} + \sin^{2}{\left(\frac{180 - x}{4 k + 2} \right)} = 0$$
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