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can theta=0 ?
Like is is\[ 0< \theta <\Pi\]
Or \[ 0 \leq \theta \leq \Pi\] ?

0<θ<2Π has to be between this interval

use substitution
y=tan(theta/2)
|dw:1383969602615:dw|

0≤θ<2Π sorry correction, it has to be between this interval

with a little bit of work you will find the solution

@RED123url I am not sure what you did there...

The answer is 0 but I used trial and error

@RED123url so just to confirm what swissgirl got, did you get the same answer?

I graphed it to confirm my answer and its def right

it should be 2pi

Well it is 0 and 2 pi
But if you noticed the interval is
\[ 0 \leq \theta < 2\pi \]

@RED123url so would you agree that in this case the answer is 0?

if 2pi is excluded of course

well then. I am going with 0. Thank you both for your help!