simplify by using identities
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@
8x³-(2x-y)³
=>(2x)³-(2x-y)³
using identity a³-b³
(2x-(2x-y)){(2x)²+(2x-y)²+(2x)(2x-y)}
(y)(4x²+4x²+y²-4xy-4x²y)
(y)(8x²+y²-4xy-4x²y)
@:-)
8x³-(2x-y)³
=>(2x)³-(2x-y)³
using identity a³-b³
(2x-(2x-y)){(2x)²+(2x-y)²+(2x)(2x-y)}
(y)(4x²+4x²+y²-4xy-4x²y)
(y)(8x²+y²-4xy-4x²y)
@:-)
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