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help!!!!!!!!!!!!!

I am having trouble with the following problem:

Given a triangle with angles A, B, C and sides a, b, c.  
A = 45 degrees
B = 60 degrees
a = 10 (this side is opposite angle A)

find b (the side opposite angle B)

The hint I have says the following:
a/sinA = b/sinB = c/sinC = 2R --> X/sin60=10/sin45

But I'm not sure what that  means.  I would greatly appreciate if anybody could please explain.  Thanks!
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上面写的是三角形面积的计算公式(三角函数的)
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