1 and the mathematical formula of I love you comes from a MV by Korean singer K.will called "I Need You". The girl wrote a mathematical formula "128 radical e980" on the blackboard for the hero to answer, but the hero couldn't figure it out after thinking hard, so the girl picked up a brush and erased the upper part of the formula, which became English I Love You.

2. The sum of squares of sin and cos is 1, SIN is divided by cos to get tan, and the range of tan is from positive infinity to negative infinity, which can be understood as "the affection between two people is infinite and immeasurable.

3. If failed love is a hyperbola, not parallel, but never intersecting, then successful love is an ellipse, and a beautiful arc is woven under the action of two focuses.

4. An equation without roots does not necessarily have roots, but may only have imaginary roots, which means that something new has come into being, which means that we can predict the future and fill in the gaps.

5. A relationship is like a curve. Contradictions may be intensified by differentiation, or they may not stop, or they may become extremely smooth and perfect because of multiple integrals.