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gerryliyana

  • one year ago

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  1. lillybeth123
    • one year ago
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    huh?

  2. abb0t
    • one year ago
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    Is this a medical emergency? If so, please call your local emergency number.

  3. gerryliyana
    • one year ago
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    it's math emergency

  4. lillybeth123
    • one year ago
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    wats ur question?

  5. gerryliyana
    • one year ago
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    These are the pictures that I've uploaded for my question

  6. lillybeth123
    • one year ago
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    oh glob, sorry i cant help, thats too hard, bye. :)

  7. abb0t
    • one year ago
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    I vaguely remember doing this, but I think you want to use the exponential form of cosh and sinh to prove it.

  8. cblrtopas
    • one year ago
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    Yeah, noob google series expansion of hyperbolic cosine and sine

  9. cblrtopas
    • one year ago
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    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.

  10. gerryliyana
    • one year ago
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    how about first one??

  11. gerryliyana
    • one year ago
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    For -1 < p < 1 prove that \[\sum_{n=0 }^{\infty} p^{n}\cos nx =\frac{ 1= pcos x }{ 1-2pcosx + p^2 }\]

  12. cblrtopas
    • one year ago
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    bleh too much effort

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