S-n-k-1-n-cos-kx-please-help-

Question Number 117144 by cantor last updated on 09/Oct/20

S_{n} = \underset{k = 1}{\prod^{n}} c o s (k x) = ? ? ? ? ? ?

p l e a s e h e l p

Answered by Olaf last updated on 10/Oct/20

No general formula for that!

Some formulas exist for particular

values of x or / and for n = \infty .

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