anonymous
  • anonymous
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Mathematics
  • Stacey Warren - Expert brainly.com
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schrodinger
  • schrodinger
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anonymous
  • anonymous
huh?
abb0t
  • abb0t
Is this a medical emergency? If so, please call your local emergency number.
anonymous
  • anonymous
it's math emergency

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anonymous
  • anonymous
wats ur question?
anonymous
  • anonymous
These are the pictures that I've uploaded for my question
anonymous
  • anonymous
oh glob, sorry i cant help, thats too hard, bye. :)
abb0t
  • abb0t
I vaguely remember doing this, but I think you want to use the exponential form of cosh and sinh to prove it.
anonymous
  • anonymous
Yeah, noob google series expansion of hyperbolic cosine and sine
anonymous
  • anonymous
So sin z is equal to some summation. You multiply it by i. Work out a few terms in the summation making sure to remember that i^2=-1 and try to simplify it to look like the sinh z formula.
anonymous
  • anonymous
how about first one??
anonymous
  • anonymous
For -1 < p < 1 prove that \[\sum_{n=0 }^{\infty} p^{n}\cos nx =\frac{ 1= pcos x }{ 1-2pcosx + p^2 }\]
anonymous
  • anonymous
bleh too much effort

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