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lillybeth123
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huh?
abb0t
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Is this a medical emergency? If so, please call your local emergency number.
gerryliyana
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it's math emergency
lillybeth123
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wats ur question?
gerryliyana
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These are the pictures that I've uploaded for my question
lillybeth123
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oh glob, sorry i cant help, thats too hard, bye. :)
abb0t
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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.
cblrtopas
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Yeah, noob google series expansion of hyperbolic cosine and sine
cblrtopas
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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.
gerryliyana
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how about first one??
gerryliyana
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For -1 < p < 1 prove that
\[\sum_{n=0 }^{\infty} p^{n}\cos nx =\frac{ 1= pcos x }{ 1-2pcosx + p^2 }\]
cblrtopas
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bleh too much effort