已知sin(x+派/6)＝1/4,求sin(x-5/6派)＋sin(派/3－x)值.速度.
问题描述：
已知sin(x+派/6)＝1/4,求sin(x-5/6派)＋sin(派/3－x)值.速度.
答
sin(x-5/6派)＋sin(派/3－x)
=sin[(x+π/6)-π]+sin[(π/2)-(π/6+x)]
=-sin(x+π/6)+cos(π/6+x)
=-1/4±√15/4