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Let the function ` f : R to R , g : R to R , h : R to R ` be defined by ` f(x) = cos x,g(x) = 2x+1 and h(x) = x^(3)-x-6`, Find the mapping h o (go h) , hence find the value of h o (go f), hence find the value of ( h o (go f) ) (x) when `x=(pi)/(3) and c=(2pi)/(3).`

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