factorise a to the power 4 minus 1 by a to the power 4
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here is ur answer dude .......
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a⁴-1/a⁴
= (a²)²- (1/a²)²
= (a²+1/a²) (a²-1/a²)
= (a²+1/a²) (a+1/a) (a-1/a)
Hope it helps
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