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Factorise each of the following expressions :
(a) #x^2- 16x + 64#
(b) #x^2- 4#
(c) #1 - x^2#
(d) #(x^2 - 16)#
(e) #x^2 - 5x + 6#
(f) #x^2 - 5x - 6#