solve this...
pls..
fast..
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=>(a+2b)(a-2b)(a²+4b²)
=> [ a²- (2b)²] (a²+4b²)
=> ( a² -4b²) (a²+4b²)
=>[ ( a² )² - ( 4b² )² ]
=> a⁴ - 16b²
=> [ a²- (2b)²] (a²+4b²)
=> ( a² -4b²) (a²+4b²)
=>[ ( a² )² - ( 4b² )² ]
=> a⁴ - 16b²
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