Factorize : (p-q) 3 + (q-r) 3 + (r-p) 3
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(p-q) 3+(q-r)3+(r-p)3
= 3p-3q+3q-3r+3r-3p
= 0
= 3p-3q+3q-3r+3r-3p
= 0
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