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# Maths :o) watch

1. Could someone please multiply this out for me as I'm having a total mind blank!

(e^x - e^-x)^2

Thanks!

Emma xxx
2. (Original post by Emz)
Could someone please multiply this out for me as I'm having a total mind blank!

(e^x - e^-x)^2

Thanks!

Emma xxx
(e^2x)+(e^-x)-2
3. I've done it now ) Thanks anyway.

Emma xxx
4. (Original post by Emz)
Could someone please multiply this out for me as I'm having a total mind blank!

(e^x - e^-x)^2

Thanks!

Emma xxx
(e^x - e^-x)(e^x - e^-x) therefore:

e^x*e^x = e^2x.
e^x*-e^-x = -1, can also be expressed as e^x*-1/e^x which gives -1.
-e^-x*-e^-x = 1/(e^x)^2

e^2x+((e^x)^-2)-2

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