1/2cos方x-sinxcosx-1/2sin方x
问题描述:
1/2cos方x-sinxcosx-1/2sin方x
求最小正周期
答
=1/4cos2x+1/4-1/2sin2x+1/4cos2x-1/4
=1/2cos2x+1/2sin2x
=根号下1/2 sin(2x+pi/4)