The question is $x = \arctan\frac 23 + \arctan\frac 12$. What is $\tan(x)$?
I'm having trouble figuring out how to calculate the arctan values without a calculator, or do I not even need to find these values to calculate what $\tan(x)$ is? Any help is greatly appreciated (I would show some sort of work, but I am actually completely stuck).
I know that the range of arctan is restricted to $(–90^\circ, 90^\circ)$ or $(-\pi/2, \pi/2)$, but i'm not sure how this helps.