1http://www.targetiit.com/iit-jee-forum/posts/limit-series-9609.html
\mathrm{f(x)}=(1+2\cos x)(1+2\cos 2x)(1+2\cos 4x)........(1+2\cos 32x)
then find
\mathrm{find \ \ f(\frac{2\pi}{13})}
for practice
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4 Answers
1@ut10 can u delete/hide ur link
let other ppl who have come across the problem for theit first try their hand on it
13Isn't there a non-Complex solution ?
All i did was writing (1+ 2cos32x) as -
(2cos16x+1)(2cos16x-1) ...but, Isse nahi lagta kuch hoga ;O