Evaluate the following integrals: 5^ x+ ^ -1 x . ( x^2+2 x^2+1 )d… - Vidyadip

Question

Evaluate the following integrals:
$\int5^{\text{x}+\tan^{-1}\text{x}}.\Big(\frac{\text{x}^2+2}{\text{x}^2+1}\Big)\text{dx}$

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Answer

$\int5^{\text{x}+\tan^{-1}\text{x}}.\Big(\frac{\text{x}^2+2}{\text{x}^2+1}\Big)\text{dx}$

Let $\text{x}+\tan^{-1}\text{x}=\text{t}$

$\Big(1+\frac{1}{1+\text{x}^2}\Big)=\frac{\text{dt}}{\text{dx}}$

$\Rightarrow\Big(\frac{\text{x}^2-1+1}{\text{x}^2+1}\Big)\text{dx}=\text{dt}$

$\Rightarrow\Big(\frac{\text{x}^2+2}{\text{x}^2+1}\Big)\text{dx}=\text{dt}$

Now, $\int5^{\text{x}+\tan^{-1}\text{x}}.\Big(\frac{\text{x}^2+2}{\text{x}^2+1}\Big)\text{dx}$

$=\int5^\text{t}\text{dt}$

$=\frac{5^\text{t}}{\log5}+\text{C}$

$=\frac{5^{\text{x}+\tan^{-1}\text{x}}}{\log5}+\text{C}$

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