What will be the value of $2^{199}\sin(\pi/199)\cdots\sin(198\pi/199)$ ? I could have found in case the functions were cosine but what should i do in case of sine?
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Try this method http://math.stackexchange.com/questions/1199431/product-of-repeated-cosec/1199444#1199444 – lab bhattacharjee Mar 28 '15 at 11:33