p³-p²c-pc²+c³=p²(p-c)-c²(p-c)=(p-c)(p²-c²)=(p-c)(p-c)(p+c)=(p-c)²(p+c)
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p³-p²c-pc²+c³=p²(p-c)-c²(p-c)=(p-c)(p²-c²)=(p-c)(p-c)(p+c)=(p-c)²(p+c)