(a² - b²) (a²+b ²)- (a²-b²)
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=> (a² - b²)(a² + b²) - (a²- b²)²
=> a⁴ + a²b² - a²b² - b⁴ - (a⁴ + b⁴ - 2a²b²)
=> a⁴ - b⁴ - a⁴ - b⁴ + 2a²b²
=> 2a²b² - 2b⁴
=> 2b²(a² - b²)
=> 2b²(a - b)(a + b)
Hope this helps...:)
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