Properties of Composite function

Q. If f: R $\to$ R , g : R $\to$ R and h: R $\to$ R are such that $f\left(x\right)=x^2$ , $g\left(x\right)=tanx$ and $h\left(x\right)=logx$, then the value of $\left(h\right(g\left(f\right(x\left)\right)\left)\right)$
if $x=\sqrt{\frac{\pi }{4}}$ will be

1. 0
2. 1
3. -1
4. $\pi$

Q.

How do I find the value of $\tan \left(\frac{5\mathrm{\pi }}{6}\right)$?