simplify using identities and also write the identify used (x+2y)3-(x-2y)3
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may be my answer is correct or not
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(a+b)3 + (a-b)3 = [a3 + b3 +3ab(a + b)] + [a3 - b3 - 3ab(a-b)]
2(a3 + 3ab2)
Therefore
(x+2y)3 + (x - 2y)3 = 2[(x)3+3× x(2y)2
= x(
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