A:①②③
B:①③④
C:②④
D:①③
I will meet Jane at the station. Please ___________ what time she will arrive.
若f(x)=3sin(2x+φ)+a,对任意实数x都有f(π3+x)=f(π3-x)且f(π3)=-4,则实数a的值等于( )
求证:Rt△ADC∽Rt△CDB.