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Where can I find development of functions like sine or cosine in continued fractions?

You can find this info in "A Concise Encyclopedia of Mathematics" by Eric Weistein, published be CRC Press.

Vince Calder

If you mean series expansion of these functions, you can find them in many college level math books.

The answers, however, are:

sin(x) = x - x^3/3! + x^5/5! - ....
cos(x) = 1 - x^2/2! + x^4/4! - ....

-- Ali Khounsary, Ph.D.
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