Find the product using suitable identities: (i) (3a + 4b)(9a² - 12ab + 16b²) (ii) (y - 6/y)(y²+6+36/y²)

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Simplify using suitable identity:
(3x - 5y - 4)(9x² + 25y² + 16 + 15xy - 20y + 12x)

Write down the following products:
(x + 6)(x + 2)