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## Homework Statement

Find if it is true that the general solution to : y'' - y' = 0, where y(x),

can be written as : y(x) = c1 cosh(x) + c2 sinh(x), where c1 and c2 are real

arbitrary constants.

## Homework Equations

differential equation solving

## The Attempt at a Solution

I just want to know what the h's mean at the end of sin and cos.