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cosh^2 x - sinh^2 x = 1
cosh x = 1+ sinh^2 x
cosh x = 1+(-3/5)^2
cosh x = 1+9/25 = 34/25
cosh 2x = 2 sinh x cosh x
cosh 2x = 2 (-3/5) (34/25)
=-204/125
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