In right triangle $ABC$ with $\angle A = 90^\circ$, we have $AB = 5$ and $BC = 8$.  Find $\sin B$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
In right triangle $ABC$ with $\angle A = 90^\circ$, we have $AB = 5$ and $BC = 8$.  Find $\sin B$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\frac{\sqrt{39}}{8}
In right triangle $ABC$ with $\angle A = 90^\circ$, we have $AB = 5$ and $BC = 8$.  Find $\sin B$.
train