y=2sin2x+2√3sinxcosx+1
=4sinxcosx+2√3sinxcosx+1
=(4+2√3)sinxcosx+1开头的2sin2x 是2sin方x 的 意思这个解答你没弄混吧？y=2sin2x+2√3sinxcosx+1=1-c0s2x+√3sin2x+1=2-2(1/2c0s2x-√3/2sin2x)=2-2c0s(60°+2x)