Apply the formula: $\int\cot\left(\theta \right)^2dx$$=-\theta -\cot\left(\theta \right)+C$
$-x-\cot\left(x\right)$
2
As the integral that we are solving is an indefinite integral, when we finish integrating we must add the constant of integration $C$
$-x-\cot\left(x\right)+C_0$
Final answer to the problem
$-x-\cot\left(x\right)+C_0$
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