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