Solution 18209: Using the Hyperbolic Functions on the TI-30X IIS/B and TI-30XS MultiView™.
How do I use the hyperbolic functions on the TI-30X IIS/B and TI-30XS MultiView?
Hyperbolic functions are analogs of regular trig functions, or better known as circular functions. Press [2nd] [HYP] to access the hyperbolic function (sinh, cosh, tanh) of the trig function to be used. Hyperbolic calculations are not affected by the mode of the calculator.
Find the cosh (5)+2.
• Press [2nd] [HYP] [COS]
• Enter 5 and press [)] [+] 
• Press [ENTER] and 76.20 will be displayed
Please see the TI-30X IIS/B and TI-30XS MultiView guidebooks for additional information.