Deriving tan power series

  • Thread starter Piano man
  • Start date
  • #1
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How can the tan power series be derived from the sin and cos power series?
Where do the Bernoulli numbers come in?
 

Answers and Replies

  • #3
75
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I was expecting something yucky, and this doesn't disappoint...

Thanks for the link :)
 
  • #4
64
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Piano man. Here is a link in http://www.voofie.com/concept/Mathematics/" [Broken] that you maybe interested.

http://www.voofie.com/content/117/an-explicit-formula-for-the-euler-zigzag-numbers-updown-numbers-from-power-series/" [Broken]

I derived the power series of the function sec x + tan x. For the tan x power series, you just take the odd terms from the expansion, since tan x is an odd function. While sec x corresponds to the even terms from the power series, as sec x is even.

It doesn't really show how Bernoulli numbers enter the expression, but it derives an explicit form for Bernoulli numbers.
 
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