The origin of the content of equation love letter:

Descartes fell in love with the little princess in Sweden in his fifties. The little princess is 18 years old. Descartes later wrote a love letter to the little princess and used it to express his love.

In fact, Descartes' love letters should start with an infectious disease in Europe. There is a disease in Europe called the Black Death, and it has also appeared in Sweden. It was at this time that Descartes met Christine, the little princess of Sweden. Later, Descartes became the princess's math teacher.

They had a sincere feeling, but Descartes was in his fifties at that time, and this feeling was not recognized by the Swedish king. So Descartes was forced to leave his princess and Sweden for France because of this.

After leaving France, Descartes still missed the little princess in Sweden so much that he began to write her love letters. But the previous love letters were intercepted by the king. At this time, Descartes showed the cleverness of mathematicians. The love letter he wrote to the princess has only one formula, that is, r=a( 1-sinθ), which is nothing but a heart in the coordinate system.

Precautions:

1. Mathematician Descartes liked to think when he was young. When he was old, he began to study science, including mathematics, because of his love for science. Descartes plays an important role in the field of mathematics. He founded analytic geometry.

2. In geometry, you will definitely learn a formula called Cartesian formula, which was invented by mathematician Descartes. Descartes proved this formula in 1635, and then this formula began to be used all over the world.