It is said that this is the content of Descartes' last love letter, which contains an unforgettable secret.

2.(x2+y2)- 16*abs(x)*y=225

My whole life is waiting for someone who can hand-draw this function for me. For aesthetic needs, our heart-shaped graphics are often like this:

3.X2+(y+3√X2)2= 1

Draw a function image, which is a heart.

4.Y= 1/X、X2+Y2=9、Y = │- 2X│X =-3│Sin Y│

Also draw functional diagrams, which are alive respectively.

5. 128√e986

Wipe off about half. If you don't, I love you.

6.r=a( 1-cosθ) or r = a (1+cos θ) (a > 0) Horizontal direction

Health and emotional line

7.x2+(y-3√x2)2= 1

A love is formed on the number axis, which is the exclusive "love curve" of the Department of Mathematics.

8. I am singing and you are singing. Don't seek the sum of squares, just tan.

9.[-5e '(2i *π)+ 1 * 3]/2 = 1 * 4

5, 2, I, 1, 3, 1, 4 can be understood as "I love you all my life"

10. Any real number, add 52.8, the result is multiplied by 5, and then subtract 3.4343. The result is multiplied by 2, and the final number is subtracted by 10 times.

11.r = 2 a * (1+cos θ), the polar coordinate image represents the heart line, which first appeared in a love letter written by Descartes to his favorite person! Of course, if you want the other person to understand, you need the other person to have a certain understanding of mathematics!