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=1-a²-a²+a pangkat 4
=1-2a²+a pangkat 4
2.(1.1)+(1.a²)+(a².1)+(a².a²)
=1+a²+a²+a pangkat 4
= 1+2a²+a pangkat 4
Kalau salah maaf.....
2. 1+2apngkat 2+ a pkt 4