5. [4] Compute
$$
\lim _{h \rightarrow 0} \frac{\sin \left(\frac{\pi}{3}+4 h\right)-4 \sin \left(\frac{\pi}{3}+3 h\right)+6 \sin \left(\frac{\pi}{3}+2 h\right)-4 \sin \left(\frac{\pi}{3}+h\right)+\sin \left(\frac{\pi}{3}\right)}{h^{4}}
$$
Answer:
$\frac{\sqrt{3}}{2}$
Solution: The derivative of a function is defined as $f^{\prime}(x)=\lim _{h \rightarrow 0} \frac{f(x+h)-f(x)}{h}$. Iterating this formula four times yields
$$
f^{(4)}(x)=\lim _{h \rightarrow 0} \frac{f(x+4 h)-4 f(x+3 h)+6 f(x+2 h)-4 f(x+h)+f(x)}{h^{4}} .
$$

Substituting $f=\sin$ and $x=\pi / 3$, the expression is equal to $\sin ^{(4)}(\pi / 3)=\sin (\pi / 3)=\frac{\sqrt{3}}{2}$.