Verified Answer :

TheHero

cosh^2x - sinh^2x = 1

coshx = sqrt( 1 + sinh^2x)
 
= sqrt(1 + (8/15)^2) = 17/15

for tanh

just divide

sinhx/coshx = tanhx = 8/17

for sech , cosech, coth << just flip the original as normal trigonometric functions 

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