• ### Can you prove this trigonometric inequality?

In acute-angled triangle ABC, prove that [CosA/CosB]² + [CosB/CosC]² +[CosC/CosA]² + 8 CosA CosB CosC ≥ 4. This was originally asked by Annie G without the condition of the triangle being acute-angled and gianlino had shown that the inequality does not hold for all triangles giving an example taking angles of the triangle as 30°, 30° and 120°. He... show more
In acute-angled triangle ABC, prove that [CosA/CosB]² + [CosB/CosC]² +[CosC/CosA]² + 8 CosA CosB CosC ≥ 4. This was originally asked by Annie G without the condition of the triangle being acute-angled and gianlino had shown that the inequality does not hold for all triangles giving an example taking angles of the triangle as 30°, 30° and 120°. He informed me that the inequality is indeed true with the condition that the triangle is acute-angled, but I do not know the proof.
6 answers · Mathematics · 6 years ago
• ### I have a US green card interview as a parent of a US citizen.?

Do I need to get fingerprinting appointment from OFC prior to the interview date? I am unable to find any website giving such date for immigrants though it is available for non-immigration visa applicants.
Do I need to get fingerprinting appointment from OFC prior to the interview date? I am unable to find any website giving such date for immigrants though it is available for non-immigration visa applicants.
1 answer · Immigration · 6 years ago

• ### What is better between the two given options?

1) You are the only answerer of a simple question and your incorrect answer gets selected as BA in voting or 2) You gave a good, correct answer to a challenging question and some other answerer's incorrect answer gets selected as BA.
1) You are the only answerer of a simple question and your incorrect answer gets selected as BA in voting or 2) You gave a good, correct answer to a challenging question and some other answerer's incorrect answer gets selected as BA.
• ### Why in Science and Mathematics section are there many one-timers ....?

who ask the question, do not give any feed-back or select BA and never return to ask again? They are not appreciative of the help they get by the answerers of this forum. This does not seem to be the case in many other sections like religion and culture or sports.
who ask the question, do not give any feed-back or select BA and never return to ask again? They are not appreciative of the help they get by the answerers of this forum. This does not seem to be the case in many other sections like religion and culture or sports.
5 answers · Mathematics · 6 years ago
• ### Are laminated Birth and Marriage Certificates accepted by NVC?

4 answers · Immigration · 6 years ago
• ### 1/(x^b + x^(-c) + 1) + 1/(x^c+ x^(-a)+1) + 1/ (x^a + x^(-b) + 1) = 1, find a + b + c?

4 answers · Mathematics · 6 years ago

I rarely participate in voting as it is more time-consuming to get just one point. But recently I found a drawback of this system and realized how some participants amass thousands of points in a week. They go for voting oldest answers which are in large numbers and vote blindly without thinking. In the process, it is possible that even an incorrect... show more
I rarely participate in voting as it is more time-consuming to get just one point. But recently I found a drawback of this system and realized how some participants amass thousands of points in a week. They go for voting oldest answers which are in large numbers and vote blindly without thinking. In the process, it is possible that even an incorrect answer may be voted. MY SUGGESTION to ensure that the correct answer gets voted is to give 3 points for voting provided the voted answer gets selected as BA and no point if the voted answer is not selected as BA.
• ### Prove this is a polynomial of degree five with integer coefficients?

(x - cos12°) (x - cos60°) (x - cos84°) (x - cos132°) (x - cos156°) Inspired by the question: http://in.answers.yahoo.com/question/ind...
(x - cos12°) (x - cos60°) (x - cos84°) (x - cos132°) (x - cos156°) Inspired by the question: http://in.answers.yahoo.com/question/ind...
2 answers · Mathematics · 6 years ago
• ### Why are our politicians obsessed with limited persons for the post of President of India?

Why can't they think of a person like Mr. Soli Sorabjee? He belongs to the minority Parsee community. You can read about his career in the following link: http://en.wikipedia.org/wiki/Soli_Sorabj...
Why can't they think of a person like Mr. Soli Sorabjee? He belongs to the minority Parsee community. You can read about his career in the following link: http://en.wikipedia.org/wiki/Soli_Sorabj...
4 answers · Government · 7 years ago
• ### Why can't Yahoo Answers find some solution to this problem?

I make errors in answering despite utmost care. Some of my contacts help me correct my mistakes by drawing my attention. But sometimes my incorrect answer gets selected as BA even by the asker even before I come to know about the error and correct the same. See the following... show more
• ### Is not one's thought a mirror of one's mind?

5 answers · Philosophy · 7 years ago
• ### May I request your opinion on the following suggestions?

1) Making network private should be disallowed. 2) Same Yahoo i.d. by different members should be disallowed. 3) YA intramail of all users should be open for ease of communication. 4) Comments posted after the answer is closed should open with the question so that they are read. 5) Comments on answers of the answerers by other answerers should... show more
• ### Is vertical scroll bar missing?

in Yahoo Answers when opened in internet explorer 8?
in Yahoo Answers when opened in internet explorer 8?

• ### Answer the following Trigo question (Re-post)?

Refer to the problem http://www.imagebam.com/image/55f9ae1825... Solve for x if AD is the median and not an angle bisector. If x can't be found, what is the maximum value of angle CAD possible? I have reposted this question as some of my contacts have interesting observations.
Refer to the problem http://www.imagebam.com/image/55f9ae1825... Solve for x if AD is the median and not an angle bisector. If x can't be found, what is the maximum value of angle CAD possible? I have reposted this question as some of my contacts have interesting observations.
8 answers · Mathematics · 7 years ago
• ### Answer the following trigo question?

Refer to the problem http://in.answers.yahoo.com/question/ind... Solve for x if AD is the median and not an angle bisector.
Refer to the problem http://in.answers.yahoo.com/question/ind... Solve for x if AD is the median and not an angle bisector.
3 answers · Mathematics · 7 years ago
• ### Should not all the countries of the world unite to work for nuclear disarmament rather than non-proliferation?

9 answers · Military · 7 years ago
• ### What has gone wrong with our Parliament?

An ordinary citizen having no political post makes one loose statement about the Parliamentarians which becomes a major national issue for our Parliamentarians, but not the serious incidents of sex racket in Delhi reported on the same day involving less than 14 year old girls, large number of incidents of corruption and black money, killing of an... show more
An ordinary citizen having no political post makes one loose statement about the Parliamentarians which becomes a major national issue for our Parliamentarians, but not the serious incidents of sex racket in Delhi reported on the same day involving less than 14 year old girls, large number of incidents of corruption and black money, killing of an IPS officer by Mafias. Lives of we, Indians, are cheaper in the eyes of our Parliamentarians as compared to a petty loose statement about their character. If they are so confident of their contribution as Mr. Sharad Yadav reported with such an anguish in the Parliament, why should they be perturbed. If they are good as they claim, they are good and an ordinary citizen's comment should not dislodge them from their duties towards the citizens of India. They are wasting time of the Parliament in discussing petty issues concerning them and not concentrating on major national issues which are becoming serious day by day. Day in and day out we keep watching news of crimes, corruption, murders, rapes, inflation and not a single report of any serious action by the government. Parliamentarians have no time to take up these serious matters, but they keep fighting on not so important matters. Why don't they dedicate themselves to the jobs for which we have elected them rather than wasting time in trying to tackle Anna's team. If they do their jobs properly, it will automatically diffuse Anna's agitation. But instead of doing that they are acting in manners only to further provoke public outrage against them further adding fuel to fire. Why are they failing to see the writing on the wall.
9 answers · Civic Participation · 7 years ago
• ### Comment on my following quote which came to my mind due to spread of terrorism?

Love your enemy if you want to kill him. Kill him if you want him to be living forever.
Love your enemy if you want to kill him. Kill him if you want him to be living forever.
7 answers · Religion & Spirituality · 7 years ago