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Complex number problem

I tried really hard to solve this problem but wasn't able quite to reach the solution Can you guys help me $\Large \prod_{\stackrel{1\leq k \leq n}{\gcd(k,n)=1}} \sin \dfrac{k\pi}n = \, ?$

Note by Ryan Bendtner
7 months, 2 weeks ago

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it was a

question · 5 months, 2 weeks ago

i got the solution i will write it there in your q soln. · 5 months, 2 weeks ago