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Junior high school mathematics balance
For the formula 1, the right side brings in the degree of a, and after the left side divides it equally, you get

After the value of formula 2 is brought in, sinBsinC= 1 is obtained.

Solve this formula and formula 2 at the same time, and you can get sinB=sinC= 1/2.

In fact, there are many such problems on the Internet, but only a little change in numerical value is different. I suggest you search for a few questions to consolidate, go in and ask the answer home page, and you can probably find many similar questions by typing.