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man111 · 29-12-2010, 04:56 PM

Calculate value of $sin(\frac{\pi}{9})\times sin(\frac{2\pi}{9})\times sin(\frac{4\pi}{9})= $

29-12-2010, 04:56 PM	#1
man111 +Thành Viên+ Tham gia ngày: Nov 2010 Bài gởi: 280 Thanks: 152 Thanked 77 Times in 49 Posts	Trigonometric product Calculate value of $sin(\frac{\pi}{9})\times sin(\frac{2\pi}{9})\times sin(\frac{4\pi}{9})= $