# ∫ Cos 2 X + X + 1 X 2 + Sin 2 X + 2 X D X - Mathematics

Sum
$\int\frac{\cos 2x + x + 1}{x^2 + \sin 2x + 2x} dx$

#### Solution

$\text{Let I }= \int\frac{\cos2x + x + 1}{x^2 + \sin2x + 2x}dx$
$Putting\ x^2 + \sin2x + 2x = t$
$\Rightarrow 2x + 2\cos 2x + 2 = \frac{dt}{dx}$
$\Rightarrow \left( x + \cos 2x + 1 \right)dx = \frac{dt}{2}$
$\therefore I = \frac{1}{2}\int\frac{1}{t}dt$
$= \frac{1}{2}\text{ln}\left| t \right| + C$
$= \frac{1}{2} \text{ln }\left| x^2 + \sin2x + 2x \right| + C \left[ \because t = x^2 + \sin 2x + 2x \right]$

Concept: Evaluation of Simple Integrals of the Following Types and Problems
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#### APPEARS IN

RD Sharma Class 12 Maths
Chapter 19 Indefinite Integrals
Exercise 19.8 | Q 27 | Page 48