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)=___.


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