Ibragimov's covariance inequality: $|\\operatorname{cov}(U,V)| \\le 2\\sqrt{\\varphi(n)}\\,\\sigma_U \\sigma_V$

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Ibragimov's covariance inequality: $|\\operatorname{cov}(U,V)| \\le 2\\sqrt{\\varphi(n)}\\,\\sigma_U \\sigma_V$ · Prove2Me