如图,在△ABC中,∠C=90°,AD平分∠CAB,已知CD=3,BD=5,则下列结论中错误的是( )
A:AC=6
B:AD=7
C:BC=8
D:AB=10
Claire knew that Gladys thought she was having an .
人际交往是具有( )
在△ABC中,内角A,B,C的对边分别为a,b,c,且3cosAcosB+1=3sinAsinB+cos2C.