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On the Fractional Infinite Series for cosecx, secx, cotx, and tanx
Published online by Cambridge University Press: 20 January 2009
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The infinite products for sinx and cosx are most conveniently obtained in a rigorous way from the well-known factorial expressions for sinnθ and cosnθ which, when n is an even integer, take the forms
θ being put equal to 
and n made infinitely great.
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- Copyright © Edinburgh Mathematical Society 1903
References
* Cf. Hobson's Trigonometry, Chap. XVII.
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