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Define f : R to R by f(x) = 4 cos^(4)(...

Define `f : R to R` by
`f(x) = 4 cos^(4)((x-pi)/(4pi^(2))) - 2 cos((x-pi)/(2pi^(2))) AA x in R` If the period of f is `kpi^(3)`, then k = ……………..

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