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If  tanhx=23
. Find the value of x and then cosh 2x.
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tanhx=(exex)(ex+ex) Let a=ex b=1ex tanhx=aba+b 23=aba+b 2a+2b=3a3b a=5b ab=e2x 2x=log(a/b) x=0.5log(5) cosh2x=cosh(log5) cosh2x=2.6

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