1+tanx分之2sin²x+sin2x=½(四分之派＜x＜二分之拍）化简

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

1+tanx分之2sin²x+sin2x=½(四分之派＜x＜二分之拍）化简
左边=(2sin²x+2sinxcosx)/(1+sinx/cosx)
=2sinx(sinx+cosx)/[(sinxc+sox)/cosx]
=2sinxcosx
=sin2x=1/2
π/2