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**1. Homework Statement**

Basically I am finishing of a projectile question and I get stuck here:

Trying to find [itex] \theta [/itex]

[tex] \frac{1}{2} (sin2 \theta) tan^2 \theta -tan \theta + \frac{1}{2} sin2 \theta = 0[/tex]

**2. Homework Equations**

**3. The Attempt at a Solution**

I tryed spliting [itex] tan \theta [/itex] into [itex] \frac{sin \theta}{cos \theta} [/itex] but I don't really get anywhere.

I know it requires using a trig identity but I can't really see a suitable one.

Thanks for the help in advance!!