✨ Best Answer ✨
a²(b²+c²-a²)-c²(a²+b²-c²)＝0
→ a²b²+a²c²-a⁴-a²c²-b²c²-c⁴＝0
→ b²(a²-c²)-(a⁴-c⁴)＝0
→ b²(a²-c²)-(a²+c²)(a²-c²)＝0
→ (b²-a²-c²)(a²-c²)＝0
→ (b²-a²-c²)(a+c)(a-c)＝0
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