Without using a calculator, find the largest prime factor of $15^4+2\times15^2+1-14^4$.
Question:
Without using a calculator, find the largest prime factor of $15^4+2\times15^2+1-14^4$.
Answer:
Let's think step by step.

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Without using a calculator, find the largest prime factor of $15^4+2\times15^2+1-14^4$.
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