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Since cosh(a) = NO/H and sinh(a) = = (ex - e -2), then 2 cosh (a ) sinh (ac) = and cosh2 (x) + sinh2(2)

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Since cosh(a) = NO/H and sinh(a) = = (ex - e -2), then 2 cosh (a ) sinh (ac) = and cosh2 (x) + sinh2(2) = Note: try to express these identities in terms of cosh (2x ) and sinh (2x). So these are the double angle formulas for the hyperbolic trig functions

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