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(p+q) (p+q) (p+q) (p+q) =
(p²+2pq+q²) (p²+2pq+q²) =
p⁴+2p³q+p²q²+2p³q+4p²q²+2pq³+p²q²+2pq³+q⁴=
p⁴+4p³q+6p²q²+4pq³+q⁴ = hasil akhir