Simplify each of the following and express it in the form (a + ib) :


Given:

We know that,


(– a – b)3 = - a3 – 3a2b – 3ab2 – b3 …(i)


So, on replacing a by 2 and b by 1/3i in eq. (i), we get





[∵ i2 = -1]








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