（sin10π/11*sin8π/11*sin6π/11）/（sinπ/11*sin3π/11*sin5π/11）*1/2^5=1/2^5,这是怎样求得的?

（sin10π/11*sin8π/11*sin6π/11）/（sinπ/11*sin3π/11*sin5π/11）*1/2^5=1/2^5,这是怎样求得的?
（sin10π/11*sin8π/11*sin6π/11）/（sinπ/11*sin3π/11*sin5π/11）*1/2^5=1/2^5,这是怎样求得的?

（sin10π/11*sin8π/11*sin6π/11）/（sinπ/11*sin3π/11*sin5π/11）*1/2^5=1/2^5,这是怎样求得的?
哎,关键是利用了【补角公式】：
sin(π-a)=sina.所以sin(10π/11)=sin(π/11).等等都是如此.
上限各自相互约分,兵对兵将对将,啊呀,那杀的是天昏地暗,日月无光啊.
于是,就只剩下“硬骨头”啦.自己就等于自己.1/2^5=1/2^5