How do you find the exact value of \arctan(2)+\arctan(3) ?

How do you find the exact value of $\mathrm{arctan}\left(2\right)+\mathrm{arctan}\left(3\right)$ ?
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terorimaox
In this way:
$\mathrm{arctan}\left(2\right)+\mathrm{arctan}\left(3\right)=\alpha$
Lets
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Tyrn7i
Explanation:
Calculator:

$\mathrm{arctan}2+\mathrm{arctan}3={135}^{\circ }$