solve in R this equation :
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Originally Posted by dhiab solve in R this equation : Hint: $\displaystyle \cos{(2x)} = 2\cos^2{x} - 1$ and $\displaystyle \cos{(3x)} = 4\cos^3{x} - 3\cos{x}$. Substitute these values appropriately and you should be able to solve the equation.
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