Here’s sth I learnt today:

Prove 0.a = 0 = a.0
Proof:
0.a = (0+0).a = 0.a + 0.a
-> 0.a + (-0.a) = (0.a + 0.a) + (-0.a)
-> 0 = 0.a + (0.a + (-0.a)) = 0.a

MA2101S is quite hard, like what u see above :-s

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