A:who
B:a
C:about which
D:with whom
已知函数f(x)=23sinxcosx﹣3sin2x﹣cos2x+2.
(1)当x∈0,π2时,求f(x)的值域;
(2)若△ABC的内角A,B,C的对边分别为a,b,c,且满足ba=3,sin2A+CsinA=2+2cos(A+C),求f(B)的值.
对如图所示历史事件的表述,正确的是( )
15的倒数是( )