# cosh and sinh

• Sep 24th 2007, 08:31 PM
helmszee
cosh and sinh
sinh x = 2.75 find cosh x exactly...???
• Sep 24th 2007, 08:42 PM
Jhevon
Quote:

Originally Posted by helmszee
sinh x = 2.75 find cosh x exactly...???

recall that $\cosh^2 x - \sinh^2 x = 1$
• Sep 24th 2007, 08:45 PM
helmszee
Quote:

Originally Posted by Jhevon
recall that $\cosh^2 x - \sinh^2 x = 1$

but mine arn't $cosh^2 or sinh^2$ what do i do with the ^2?
• Sep 24th 2007, 08:47 PM
Jhevon
Quote:

Originally Posted by helmszee
but mine arn't $cosh^2 or sinh^2$ what do i do with the ^2?

umm, you square the answer you have for sinh(x) plug it into the formula, solve for cosh^2(x) and then square root both sides