1, exponential function, logarithmic function, trigonometric function, numbers are full of hardships;

2. Parallel straight lines, crossed straight lines, straight lines in different planes, and affectionate lines.

Teacher, your knowledge is described as ∞ with this symbol.

4. Teacher, your love for us is like a number-endless; Teacher, your kindness to us is like a light-a beginning without an end. Teachers are always+∞ in my mind.

Extended data:

Math teachers sow seeds in language, cultivate with colored pens, irrigate with sweat, and moisten with painstaking efforts. This is the noble work of beloved teachers. With youth, dreams come true; Have happiness, often accomplish a lot; With wealth, peaches and plums are everywhere.

The math teacher gave half the formula to the students, and the students will give you the other half. Addition, subtraction, multiplication and division can't count the dedication made by the teacher! Poetry and songs can't help but praise the teacher! The math teacher teaches "success = your teaching+our efforts".