1+tanx分之2sin²x+sin2x=½(四分之派＜x＜二分之拍）化简_数学解答

1+tanx分之2sin²x+sin2x=½(四分之派＜x＜二分之拍）化简

人气：188 ℃　时间：2020-04-07 20:38:29

解答

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