Trigonometric functions are one of the basic concepts in mathematics.

He is good at solving problems of trigonometric functions.

A transcendental function is a type of function that cannot be expressed as a solution to an algebraic equation.

Algebraic functions are a part of mathematics, and understanding them is important.

The sympathetic nervous system controls the body's stress response.

We should always remember the power of Kannon in difficult times.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.