# Easy Calculus

Calculus Level pending

$\large \int_0^{\frac{\pi}{2}} ~~ \tan\left(\frac{\theta}{2}\right) ~ d\theta$

If the value of above integral is in the form $$\ln \left(A\right)$$, find the value of $$A$$.

Notation: $$\ln \left( \cdot \right) = \log_e (\cdot)$$ denotes the natural logarithmic function.

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