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Factorise the following using appropriat...

Factorise the following using appropriate identities
`(i) 49 a ^(2) + 70 ab + 25 b ^(2)`
(ii) `9/16 x ^(2) - (y ^(2))/( 9)`
(iii)` t ^(2) - 2t +1`
(iv)` x ^(2) + 3x +2`

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