Mathematics, 25.10.2021 19:10 lauren203

n ∈ Z +, đặt fn(x) = sin x sin 2x · · ·sin(2^nx). prove that: |fn(x)| ≤ 2/ √ 3 |fn( π /3 )|, ∀x, n. please help me!!!

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n ∈ Z +, đặt fn(x) = sin x sin 2x · · ·sin(2^nx). prove that: |fn(x)| ≤ 2/ √ 3 |fn( π /3 )|, ∀x, n....

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