Factorise (Using identity):
16 a4 -1/81
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Answer:
16a⁴ -1/81
= (2a)⁴ -(1/3) ⁴
= [(2a) ² -(1/3) ² ]*[ (2a)² +(1/3) ²) ]
= (2a+1/3) (2a-1/3) (4a²+1/9)
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