please help to solve this ...
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Answer:
a²+b²
Step-by-step explanation:
a⁴- b⁴ = (a²)² - (b²)²
(a²-b²) × ( a²+b²) ÷ (a²-b²)
= a²+b². ( a+b) × (a-b) = a²- b²
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