Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

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

Evaluate

$\ln(x^{2}+1)+С$

Differentiate w.r.t. x

$\frac{2x}{x^{2}+1}$

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