Evaluate each of the following using identities: (i) (2 x-1/x)^2 (ii) (2 x+y)(2 x-y) (iii) (a^2 b...

Evaluate each of the following using identities:
(i) (2 x-1/x)^2
(ii) (2 x+y)(2 x-y)
(iii) (a^2 b-b^2 a)^2
(iv) (a-0.1)(a+0.1)
(v) (1.5 x^2-0.3 y^2)(1.5 x^2+0.3 y^2)

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