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MathNet 2009-part-05 — 172 problems (EN–VI) Question 94

Math Olympiad Vault · MathNet 2009-part-05 — 172 problems (EN–VI)

Question 94

Compute
$$
\lim_{h \rightarrow 0} \frac{\sin \left(\frac{\pi}{3}+4 h\right)-4 \sin \left(\frac{\pi}{3}+3 h\right)+6 \sin \left(\frac{\pi}{3}+2 h\right)-4 \sin \left(\frac{\pi}{3}+h\right)+\sin \left(\frac{\pi}{3}\right)}{h^{4}}
$$