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