Answer :

Using Identity:

(x – y)^{3} = x^{3} – y^{3} – 3x^{2}y + 3y^{2}x

(3a – 2b)^{3} = (3a)^{3} – (2b)^{3} – 3(3a)^{2}(2b) + 3(2b)^{2}(3a)

= 27a^{3} – 8b^{3} – 54a^{2}b + 36b^{2}a

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