the most practical application of Taylor's series.

[Mohammad Salek Parvez]

ছাত্ররা প্রায় প্রশ্ন করে, এত অংক করে কি লাভ ? এর practical application কি ? তাদের কে এ কাহিনী টি বলা যেতে পারেঃ
During the Russian revolution, there is a story of a mathematician who was mistaken by rebels to be a
communist spy. He was promptly captured by a local gang and
interrogated. When he said that he is a mathematician, the gang leader
asked him to back up his claim by deriving the formula for the Taylor
Remainder Theorem. He was warned that if he failed, he would be shot on
the spot. After some sweating the mathematician finally derived the
result. The gang leader was satisfied with the proof and let him go.[ taken from Alex R. on MathOverflow ]
এর চেয়ে মজার application আর কি হতে পারে ?