Example

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

Question

$$\displaystyle\int{ - \frac{ 1 }{ 1+ { x }^{ 2 } } }d x$$

Evaluate

$-\arctan(x)+С$

Differentiate w.r.t. x

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

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