1+tanx分之2sin²x+sin2x=½(四分之派＜x＜二分之拍）化简

来源：学生作业帮助网编辑：作业帮时间：2024/05/30 04:01:28

左边=(2sin²x+2sinxcosx)/(1+sinx/cosx)
=2sinx(sinx+cosx)/[(sinxc+sox)/cosx]
=2sinxcosx
=sin2x=1/2
π/2