Euler's theorem

例句：

1. 1.The proof of the theorem is based on the mathematical theory of relativity.
   该定理的证明基于相对论的数学理论。
2. 2.In this problem, we need to use Euler's theorem to find the value of the unknown variable.
   在这个问题上，我们需要使用欧拉定理来找到未知变量的值。
3. 3. Euler's theorem has been proven to be accurate for many years, and it is widely used in various fields of mathematics.
   欧拉定理已经被证明多年来是正确的，它在许多数学领域都有广泛的应用。