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# e Watch

1. How is

$\fn_cm \frac{e^{-2}-e^{-4}}{2}=\frac{e^{2}-1}{2e^{4}}$

?
2. (Original post by Banny Dyrne)
How is

$\fn_cm \frac{e^{-2}-e^{-4}}{2}=\frac{e^{2}-1}{2e^{4}}$

?
. Same thing for

So

Multiply top and bottom of by (to get a common denominator)

EDIT: Why did I get negged?
3. (Original post by Banny Dyrne)
How is

$\fn_cm \frac{e^{-2}-e^{-4}}{2}=\frac{e^{2}-1}{2e^{4}}$

?
Just multiply numerator and denominator of LHS by
4. Oh ok. Is it necessary to do this simplification though?
5. (Original post by Banny Dyrne)
Oh ok. Is it necessary to do this simplification though?
necessary for what?
6. (Original post by Banny Dyrne)
Oh ok. Is it necessary to do this simplification though?
Not really but the RHS looks prettier.
7. (Original post by Banny Dyrne)
How is

$\fn_cm \frac{e^{-2}-e^{-4}}{2}=\frac{e^{2}-1}{2e^{4}}$

?
using the facts that:

and
you should be able to do it.
Spoiler:
Show
multiply both the numerator and denominator by

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