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Simplify:
(i)
(ii)
(iii)
(iv)
(v) (vi)
∵ (a + b) (a - b) = a2 - b2
=
(ii)
∵ (a + b) (a - b) = a2 - b2
(iii)
∵ (a + b) (a - b) = a2 - b2
=
=
=
(v)
∵ (a - b)2 = a2 + b2 - 2ab
=
(vi)
∵ (a - b)2 = a2 + b2 - 2ab
=