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Gaokao Math Practice Question

4. (5 分) $\triangle A B C$ 的内角 $A 、 B 、 C$ 的对边分别为 $a 、 b 、 c$. 已知 $a=\sqrt{5}, c=2, \cos A=$ $\frac{2}{3}$, 则 $b=(\quad)$

  1. A.$\sqrt{2}$
  2. B.$\sqrt{3}$
  3. C.2
  4. D.3

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