Geometry Level 4

Given a triange $$ABC$$, construct squares $$ABPQ$$ and $$ACRS$$. Suppose that $$M$$ is midpoint of $$PR$$. Join $$MB$$ and $$MC$$. Find $$\frac{MB}{MC}$$.

Details and Assumptions:

$$P$$ and $$C$$ are on opposite side of $$AB$$.

$$R$$ and $$B$$ are on opposite side of $$AC$$.

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