Я решила уравнение
Sqrt(sin(x)+2cos(2x))-sqrt(2)cos2x=0

У меня получились такие корни:
X=pi*n
X=2pi*n-9pi/10
X=2pi*n-pi/10
X=2pi*n-5pi/6
X=2pi*n-pi/6

Нужно найти корни на отрезке [-pi;pi]

Помогите:(

Помогите,пожалуйста с CONCLUSION? и проверьте эссе в целом.

Experience of my life

My name is Anna. I am 18 years old. I am from Russia. I find myself a powerful person. Becoming me as a strong personality began in childhood when I started to play volleyball. Our team had to "fight for place" in the starting lineup, where you must show leadership qualities. Doing this sport for a long time, I have become stronger and smarter person. I can also add that I learned very well to adapt fast to the situation, I can feel where I can say something, comment, add and where I shouldn't do it. What is more, I am very emotional, but a lot of feelings I keep inside. In a stressful situation for some time I can be suppressed like any another person, but I try to treat everything positive. Besides, I am very caution. Before I do something, I think about future repercussion. Nevertheless, one should accept that I am purposeful. If I have a goal, I will achieve the goal any ways and any methods. Despite any qualities, I am afraid of the terrible situations that can happen in our lives. So, this story will be about the fear of my life.

I had some experience in my life when I was really scared. It happened in Los Angeles in 2010. It was summer time. I have been studying English in a language school. When I arrived from school to my home, I went to cafe. One guy fixedly looked at me for a long time... I thought: "It is ok! It is not a reason for worry". I have just decided to change this cafe to a different place. When I went out, he went with me. I was in shock. In a result, I decided to come back home. This guy followed me and shouted something. I began to run where I saw people. When he saw that I haven't already been alone, he stopped to go after me. Then I came home and couldn't believe that this situation happened to me. I can't even imagine what would happen if I didn't see the people and wouldn't go in their direction. I remember that after this incident, I was depressed for a long time. I never told anyone of close people about it. I didn't want them to be worry. Nowadays, I am so happy that everything ended good and I'm scared to be solitary in unknown places.

I have changed as a person and I can feel the changes myself. I became to see many situations in my life on the other hand. For example, before when I listened something about similar situations, I didn't understand all... So, I became more careful to my life. I began to appreciate life more. Now I try not to walk alone in the evening in unfamiliar places. We can't know everything that can happen to us, so we need to value every moment.

To sum up, I believe that we will finally solve all our problems and will live happily. We must take good care of our life and be careful everywhere.