Articles
Register
Sign In
Search
tagada1
@tagada1
January 2021
1
66
Report
Svp j'ai vraiment besoin d'aide pour ces 2 exercices
Please enter comments
Please enter your name.
Please enter the correct email address.
Agree to
terms and service
You must agree before submitting.
Send
Lista de comentários
gilles2016
Exercice 30
1)
on sait que sin²(π/5)+cos²(π/5)=1
donc sin²(π/5)= 1-cos²(π/5)
= 1- [(√5+1)/4]²
= 1-(√5+1)²/16
= 1-(5+2√5+1)/16
= 1-(6+2√5)/16
= (10-2√5)/16
or π/5∈[0;π/2] alors sin( π/5)>0
Donc sin(π/5)=
√(10-2√5)/4
2)
a) sin(4π/5)=sin(π-π/5)=sin(π/5)=
√(10-2√5)/4
cos(4π/5)= cos(π-π/5)=
-
cos(π/5)=
-(√5+1)/4
b) sin(-π/5)=-sin(π/5)=
-
√(10-2√5)/4
cos(-π/5)=cos(π/5)=
(√5+1)/4
c)
cos(6π/5)=cos(π+π/5)=-cos(π/5)=
-(√5+1)/4
sin(6π/5) = sin(π+π/5)=-sin(π/5)=
-
√(10-2√5)/4
d) cos(3π/10)=cos(π/2-π/5)=sin(π/5)=
√(10-2√5)/4
sin(3π/10)=sin(π/2-π/5)=cos(π/5)=
(√5+1)/4
Bon courage !
1 votes
Thanks 1
tagada1
Merci infiniment ! :)
gilles2016
je t'en prie !
More Questions From This User
See All
tagada1
February 2021 | 0 Respostas
Bonjour est ce que quelqu'un peut me corriger svp c'est pour demain :( I have chosen to presents an article of quality press whose name is « Brtual Images of Syrian Boy drowned off Turkey Must be seen, Activist Say» . I think is an article of qualitfy press because it deals wich an important subject. This article talk about the death of the young refugees, old 3 years-old. He's dead because with his family, they have tried to rejoin an other country for avoid the war in Syria. His body have been discovered by a Turkish police officer on the beach «face down in the sand». The Aylan's death at to leave people deeply saddened, many organizations of media organized several debate for know which published picture, some organizations decided to published a rather hard picture about the Aylan's death for to react people whereas others organizations want to published a softer picture ecause they don't want Aylan's become a symbol of refugees. After the announcement of Aylan's death Omer Mohsin «a survivor of the capsizing» wish to tell the living conditions of refugees, he explains there are many persons in a boat with a limited capacity for received each refugees wishing avoid the war and we can think this is one of leading cause of death. I think it's a shame for waiting the death of young boy or an adult person to react the people, it's just unlikely ! This is representative of our society, everyone expects that something is going to finally react and now many people think it's necessary to help this refugees, much debate taking place about it here. This picture has revolt many people which raised awareness that their act was better instead of acting as if nothing is happening. This article affects me personally and it's for that I have chosen it, it's was very important for to denounce this comportement because this little boy and everyone who have sudden the war asked nothing anybody and every country should show solidarity, it does not mean that what arrives at them does not concern us.
Responda
tagada1
February 2021 | 0 Respostas
Svp, aidez moi et corrigez moi :(
Responda
tagada1
February 2021 | 0 Respostas
Bonjour, quelqu'un pourrait me corriger svp ? The economic of India: Since the late 1980's, India has been come attractive to foreign investors. His economic sectors are the agricultural products, the textile goods, the gems and jewellery, the software services and technology like the mobiles or Internet, the engineering goods, chemicals and leather products. The social of India: India have 1,5 billion citizens. Her most populated cities are Bombay with 16,4 millions residents and Calcutta with 13,2 million. Most of the inhabitants speak Hindi or English and practice the Indian religions (Hindu.). Her population know religious tension between the Hindu and Muslim practicing. Her population know differents improvements like the role of woman, which has been change. Now they can drive their company and join universties. Furthermore, India's population know a gap between the rich and the poor habitants. In fact, we can see a different landscape in India. There are the slums for the poor people and the skyscraper for the rich people. The historic of India: India was dominate by the Muslim dynasty in the 18 century and colonised by Britain who had assumed her political control in 1750 and included at this time Bangladesh and Pakistan. But in 1947, India became independent and was divided into two States: India and Pakistan. Now, this two states have multiple conflicts between them.
Responda
tagada1
February 2021 | 0 Respostas
Bonjour, Est-ce que quelqu'un pourrais me corriger svp ? Dear President, I'm writing in reply to the recent events that have occured for this month about the syrian and african refugees. In fact, i'm indignant in front of the European Community's react. Some people think that all refugees are terrorist and they may steal their job because they will work for less money but it's false. The refugees just try to escape from a horrible situation which is the conflict with the Islamic State. But with the reject of European Community justified by their fear, it's impossible for them to stay alive. Europe condemns them to death as she condemned this litte Syrian boy, found dead on the beach of Turkey. The other argument developed by the European people and more precisely the European gouvnerment who consider that has too generous with the syrian or the african, it's that the gouvnerment will pay and spend too much for them. I'm angry that my government should be put in such a ridiculous position. This must change. They should understand that the refugees don't have an other place to go, except Europe because it's close to them. We should help them ! Let us champion the millions of immigrants who are seeking liberty in the same manner that we would if we were in their skin ! I would be grateful if you could think on the following. Yours sincerely,
Responda
tagada1
February 2021 | 0 Respostas
Bonjour Est-ce que quelqu'un pourrais corriger mon travail svp ? September 14th 2015. I'm writing in reply to the recent events that have occured for this month about the syrian and african refugees. In fact, i'm indignant in front of the European Community's react. They think the refugees may steal their job because they will work for less money but it's false. The refugees just try to escape from a horrible situation which is the conflict with the Islamic State. But with the reject of European Community justified by their fear, it's impossible for them to stay alive. Europe condemns them to death. The other argument developed by the European people and more precisely the European gouvnerment who consider that has too generous with the syrian or the african, it's that the gouvnerment will pay and spend too much for them. I'm angry that my government should be put in such a ridiculous position. It must change. They should understant that the refugees don't have an other place to go, except Europe because it's close to them. We should help us ! Let us champion the millions of immigrants who are seeking liberty in the same manner that we would if we were in their shoes ! I would be grateful if you could think on the following. Yours sincerely,
Responda
tagada1
February 2021 | 0 Respostas
Bonjour, j'ai un devoir en anglais qui consiste à faire une lettre au président de la république suite aux récents évènements et j'aimerais que quelqu'un me corrige par rapport aux fautes que j'aurais pu faire merci ^^ I'm writing in reply to the recent events that have occured for this month about the syrian and african refugees. In fact, i'm indignant in front of the European Community's react. They think the refugees may steal their job because they will work for less money but it's false. The refugees just try to escape from a horrible situation which is the conflict with the Islamic State. But with the reject of European Community justified by their fear, it's impossible for them to stay alive. Europe condemns them to death. The other argument developed by the European people and more precisely the European gouvnerment who consider that has too generous with the syrian or the african, it's that the gouvnerment will pay and spend too much for them. I'm angry that my government should be put in such a ridiculous position. It must change. They should understant that the refugees don't have an other place to go, except Europe because it's close to them. We should help us ! Let us champion the millions of immigrants who are seeking liberty in the same manner that we would if we were in their shoes ! I would be grateful if you could think on the following. Yours sincerely,
Responda
tagada1
February 2021 | 0 Respostas
Bonjour, j'ai un devoir en anglais qui consiste à faire une lettre au président de la république suite aux récents évènements et j'aimerais que quelqu'un me corrige par rapport aux fautes que j'aurais pu faire merci ^^
Responda
tagada1
February 2021 | 0 Respostas
J'aurais besoin d'aide svp
Responda
tagada1
February 2021 | 0 Respostas
Svp aidez moi :(((((
Responda
tagada1
January 2021 | 0 Respostas
Bonjour, est ce que quelqu'un pourrait me dire ce que signifie le symbole fer de cheval en mathématiques svp
Responda
×
Report "Svp j'ai vraiment besoin d'aide pour ces 2 exercices.... Pergunta de ideia de tagada1"
Your name
Email
Reason
-Select Reason-
Pornographic
Defamatory
Illegal/Unlawful
Spam
Other Terms Of Service Violation
File a copyright complaint
Description
Helpful Links
Sobre nós
Política de Privacidade
Termos e Condições
direito autoral
Contate-Nos
Helpful Social
Get monthly updates
Submit
Copyright © 2025 ELIBRARY.TIPS - All rights reserved.
Lista de comentários
1) on sait que sin²(π/5)+cos²(π/5)=1
donc sin²(π/5)= 1-cos²(π/5)
= 1- [(√5+1)/4]²
= 1-(√5+1)²/16
= 1-(5+2√5+1)/16
= 1-(6+2√5)/16
= (10-2√5)/16
or π/5∈[0;π/2] alors sin( π/5)>0
Donc sin(π/5)= √(10-2√5)/4
2)
a) sin(4π/5)=sin(π-π/5)=sin(π/5)=√(10-2√5)/4
cos(4π/5)= cos(π-π/5)=-cos(π/5)=-(√5+1)/4
b) sin(-π/5)=-sin(π/5)=- √(10-2√5)/4
cos(-π/5)=cos(π/5)=(√5+1)/4
c) cos(6π/5)=cos(π+π/5)=-cos(π/5)=-(√5+1)/4
sin(6π/5) = sin(π+π/5)=-sin(π/5)=- √(10-2√5)/4
d) cos(3π/10)=cos(π/2-π/5)=sin(π/5)=√(10-2√5)/4
sin(3π/10)=sin(π/2-π/5)=cos(π/5)=(√5+1)/4
Bon courage !