sin2X/(1+cosX+sinX)化简

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sin2X/(1+cosX+sinX)化简sin2X/(1+cosX+sinX)化简sin2X/(1+cosX+sinX)化简sin2X/(1+cosX+sinX)=2sinxcosx/(1+cosX

sin2X/(1+cosX+sinX)化简
sin2X/(1+cosX+sinX)化简

sin2X/(1+cosX+sinX)化简
sin2X/(1+cosX+sinX)=2sinxcosx/(1+cosX+sinX)=[(cosx)^2+2sinxcosx+(sinx)^2-1]/(1+cosX+sinX)=[(cosX+sinX)^2-1]/(1+cosX+sinX)=cosX+sinX-1