来自林宏杰的问题
若cosxcosy+sinxsiny=12,sin2x+sin2y=23,则sin(x+y)=___.
若cosxcosy+sinxsiny=12,sin2x+sin2y=23,则sin(x+y)=___.
1回答
2020-04-1420:25
若cosxcosy+sinxsiny=12,sin2x+sin2y=23,则sin(x+y)=___.
若cosxcosy+sinxsiny=12,sin2x+sin2y=23,则sin(x+y)=___.
∵cosxcosy+sinxsiny=12