A geometry problem by Archit Tripathi

Geometry Level pending

Let $$'J'$$ be any point lying on the circum-circle of a square $$PQRS$$ let $$ABC$$ be an equilateral triangle inscribed in the same circle. The radius of the circle is $$r$$, then $$(JA)^{4} + (JB)^{4} + (JC)^{4} = mr^{n}$$. Find the value of $$m - 2n$$

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