A:If you didn’t help me
B:Had you not helped me
C:If you haven’t helped me
D:Haven’t you helped me
在锐角△ABC中,b2-a2-c2ac=cosA+CsinAcosA
(1)求角A;
(2)若a=2,求bc的取值范围.
词语活用情况相同的一项是( )