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## Homework Statement

show that the limit as h approaches zero of ((cosh-1)/h) = 0.

## Homework Equations

*The bold numbers preceding each line are simply line numbers, they are not apart of the equations.*

**1**lim (as h approaches 0) of ((cosh - 1)/h)

**2**= lim (as h approaches 0) of -((2sin

^{2}(h/2))/h)

**3**= -lim as theta approaches zero of ((sin[tex]\Theta[/tex]/[tex]\Theta[/tex])*sin[tex]\Theta[/tex]

**4**= -(1)(0)

**5**= 0

I'm confused as to how the author of the text was able to get from line 1 to line 2. If someone could workout the steps between these two lines I would be appreciative. I'm drawing a blank here!

Thanks