5m Zen
B 2 c 2 4a 2 4ab
B 2 c 2 4a 2 4ab pictures 5
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B 2 c
B 2 c 2 4a 2 4ab
4a 2 b 2 c 2 4ab 2bc 4ca
factorise 4a 2 b 2 c 2 4ab 2bc 4ac
factorise 4a 2 4ab b 2 c 2
factor completely b^2-c^2+4a^2-4ab
b 2 c 2 4a 2 4ab
