Before I explain what kind of identity that I have, first I would like to explain what trigonometry is. In trigonometry, we study the areas and length of the triangle. Basically, in trigonometric function, there are three functions; sine, cosine, and tangent. The reciprocal of those are cosecant, secant, and cotangent. The basic characteristic of a sine function, which I like to explain is the ‘changing’. Sine graph keep mutates as time passes. We can also find some characteristics, that sine function starts below 0, and cosine function doesn’t. Basically, looked by outside wise, ∫cos(x)dx= sin(x). Which implies they have the same shape. The reason why I chose the sine graph was simple, it’s because it passes the origin. Some people might ask ” Life always starts at the certain point. Why did you think life starts from an origin?” I want to say this. Life can’t be started by myself. To live my own life, it’s necessary that parents and friends, all the people around me have to support me. Without them, myself is nothing. It’s a negative. Think about newborn babies. They can do nothing but cry for help, eat, sleep, and breathe. Without any other people’s help, they can’t survive. They will die because they are so weak. Here is an interesting fact. Every person has common stages of development. Every person has their own time once they were a baby, once they were a kid, living their lives as adults and seniors, and death. Every person can’t change the time or go back to the time once they used to be. Every person experiences their ups and downs in their life, no matter who they are. This can share the common characteristics of sine graph, which starts from the origin, has ups and downs, but keep going otherwise. The experiences in downs are common. 4 percent of people in the world are diagnosed with depression, and half of the people in the world experience some stages of depression. It can be whether mild enough to recover easily, or it might be so serious that can take one’s life. And truly, there are some good moments in life that we can enjoy ourselves. Even though the length of time might vary from individuals. Being ‘happy’ or ‘sad’ is a subjective emotion; which means it can be accepted differently by people, even though one experienced exactly the same event. If one lives life proactive and has a bright point of view through life, the sing graph of happy moments will be longer, and one can enjoy the life. To add on. ‘depression’ and ‘typical sadness’. We can say if sadness is something temporary and makes you stronger, however, the depressed condition itself can’t make you stronger, it makes you feel ‘out of control’ ‘ ‘makes you feel down all the time; ‘feels your brain is drained’ and sometimes ‘you want to quit.’ Depression is such a condition that has to be treated by others, or yourself to get back to the ‘normal sign graph’ of life. Sometimes people need to be recharged. Sometimes people are just burned out and can’t take it anymore. It’s hard to get out of bed, everyday tasks become so hard. Even getting out of the bed or to eat. You are tired for no reason. Sometimes, you wish you can end your life, but sadly, you can’t. here is a sort kind of thing that normal people wouldn’t understand.
Was a bit of off topic, but I want people to remember this. There is dark part in life, and you may go through those part. However, things can be changed. Just hold on and give yourself a certain amount of time and daily goal the achieve. I can tell this, depression is not a sign of weakness, everyone has both ups and downs in life, which like a sine graph. I can tell it, as my life, and probably every people’s life is like a sine graph, even though the shapes might be different. And I can say, sine graph is my sign because it will truly describe what I’ve been to, and what I am going through.