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(iii) By how much is x4 - 4x< y2 + y4 less than x4 + 8x2y2 + y4 ?
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Answer:
(x4 + 4x2y2 + y4) - (x4 - 8x2y2 + y4)
= x4 + 4x2y2 + y4 - x4 + 8x2y2 - y4
= 12 x2y2
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