A. cosh 2
B. cosh 8- cosh 2
C. cosh 15
D. cosh 8+ cosh 2
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=