Q. 335.0( 1 Vote )

# Evaluate the following Integrals:

Let

In the denominator, we have x4 + x2 + 1

Note that we can write x4 + x2 + 1 = (x4 + 2x2 + 1) – x2

We have x4 + 2x2 + 1 = (1 + x2)2

x4 + x2 + 1 = (1 + x2)2 – x2

So, using this, we can write our integral as

Dividing numerator and denominator with x2, we have

Put,

(Differentiating both sides)

So, the new limits are ∞ and 2.

Substituting this in the original integral,

Recall,

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