integral

The student had trouble calculating the definite integral of the complex trigonometric function.

(Chinese) 这个学生在计算复杂三角函数的定积分时遇到了困难。

If F(x) is the integral of f(x), then its derivative is equal to f(x).

(Chinese) 如果F(x)是f(x)的积分，那么它的导数就等于f(x)。

Encryption has become an integral part of modern digital communication security.

(Chinese) 加密已成为现代数字通信安全不可或缺的一部分。

Zinc is an integral component of the enzymes needed for DNA synthesis.

(Chinese) 锌是DNA合成所需酶的核心组成成分。