Descartes love curve, also known as heart line and Valentine's Day curve, is a popular mathematical figure. It consists of two symmetrical semicircles and looks like a real heart. This number is often used to express love and affection when celebrating Valentine's Day.

Definition of Cartesian love curve: Cartesian love curve is a polar coordinate equation, which presents a very beautiful image in Cartesian coordinate system. Its shape is similar to true love: both sides are symmetrical and there is a tiny tail in the middle.

The history of Descartes' love curve: Descartes' love curve was first put forward in Europe in17th century, but it didn't become popular until19th century. Today, it has become a world-famous mathematical figure.

Cartesian love curve is not only a beautiful mathematical figure, but also has a wide range of applications. The following are some common application scenarios:

1, Valentine's Day: The shape of Descartes' love curve is very suitable for expressing the romantic atmosphere of Valentine's Day.

2. Advertising: Many companies will advertise with Cartesian love curve on Valentine's Day to express their love and care to customers. This method can not only attract customers' attention, but also improve the brand image of the company.

3. Artistic creation: Many artists will take Descartes' love curve as their creative inspiration. The shape of love in works of art is often very vivid.