Answer :

We need to find the limit for:

As limit can be find out simply by putting x = a because it is not taking indeterminate form(0/0) form, so we will be putting x = a

Let, Z =

⇒ Z =

This can be further simplified using a^{3} – 1 = (a–1)(a^{2} + a + 1)

⇒ Z =

⇒ Z = (1+a)^{4} + (1+a)^{2} + 1

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