find product : (16m^2-9n^2)(16m^2+9n^2)
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a²-b²= (a+b)(a-b)
[16m²-9n²][16m²+9n²]
=(16m²)²- (9n²)²
= 256m^4 -81n^4
a²-b²= (a+b)(a-b)
[16m²-9n²][16m²+9n²]
=(16m²)²- (9n²)²
= 256m^4 -81n^4
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