化简2sinxcosx+cos2x
问题描述：
化简2sinxcosx+cos2x
答
2sinxcosx+cos2x=根号2[sin(2x+π/4)]
答
原式＝sin2x+cos2x=2^(0.5)sin(2x+pi/4)
答
2sinxcosx=sin2x
2sinxcosx+cos2x=根号2[sin(2x+π/4)]