13., 17., 18., 19., 20., 21., 23.
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(a+b)³-(a-b)
=(a+b)³-(a-b)
take (a+b) common
=(a+b){(a+b)²-1}
(a+b)(a²+b²+2ab-1)[(a+b)²= a²+b²+2ab]
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Which branch in chaitanya
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