# Math Help - cosh and sinh

1. ## cosh and sinh

sinh x = 2.75 find cosh x exactly...???

2. Originally Posted by helmszee
sinh x = 2.75 find cosh x exactly...???
recall that $\cosh^2 x - \sinh^2 x = 1$

3. 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?

4. 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