If cosh x= sec θ, then tanh² x/2=

log(x-1+√(x²-2x)(x≥2) is equal to

2 cosh 3 cosh 5=

If coth x= sec θ, then cosech x=

If y= 1/2 Cosech^-1 (1/2x√(1+x²)), then x=

If sinh x= cos θ and sin θ=2/3 then cosh x=