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Prove : ∀x∈IR, ∀n∈IN^∗ ∫^( (π/2)) _( 0) ch(2xt)cos^(2n) (t) dt ≤ e^(x^2 /n) ∫^( (π/2)) _( 0) cos^(2n) (t) dt
Logarithms JJgrads  
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