Factorise 8x³-y³-12x²y+6xy²
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8x³-y³-12x²y+6xy² is of the form a³-b³-3a²b+3ab²
so,... (2x)³-y³+3(2x)²*(-y)+3(2x)(-y)²
=(2x-y)³
so,... (2x)³-y³+3(2x)²*(-y)+3(2x)(-y)²
=(2x-y)³
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