physics chemistry maths science forums
become expert I help I sign up I login
refer a friend - earn nickels!!   
 advanced
 
Home
Ask & Discuss Questions
Study Material
Experts Zone
Hang Out!

Ask & Discuss Questions with Community & Experts

 Moderation Team
 90 chars left    advanced
Ask iit jee aieee pet cbse icse state board community Community Discussion Question: find the value
Forum Index -> Trignometry like the article? email it to a friend.  
Author Message
[Post New]14 May 2008 14:01:58 IST
    Subject: find the value
[Up] View Post
ashish_banga (937)

Blazing goIITian

Olaaa!! Perrrfect answer. 147  bad job dude!! I dont approve of this answer! 1  [250 rates]
ashish_banga's Avatar
total posts: 1305    
offline Offline

if SinA + sinB = 1/2   and CosB + CosA = 31/2 / 2  


 


find the value of 3A + B
    
[Post New]14 May 2008 14:12:49 IST
    Subject: Re:find the value
[Up] View Post
allamraju (3410)

Blazing goIITian

Olaaa!! Perrrfect answer. 604  [799 rates]
allamraju's Avatar
total posts: 1014    
offline Offline
Is there any relation between A,B,C like they are the angles of a triangle etc
MAKING A MISTAKE IS HUMAN BUT REPEATING IT IS IDIOTIC.
 this reply: 0 points  (with 0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]
 
You have to be logged on to rate
  
[Post New]14 May 2008 14:57:58 IST
    Subject: find the value
[Up] View Post
ashish_banga (937)

Blazing goIITian

Olaaa!! Perrrfect answer. 147  bad job dude!! I dont approve of this answer! 1  [250 rates]
ashish_banga's Avatar
total posts: 1305    
offline Offline
sorry everyone. i have edited the question
 this reply: 0 points  (with 0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]
 
You have to be logged on to rate
  
[Post New]14 May 2008 15:16:15 IST
    Subject: find the value
[Up] View Post
joyfrancis (1504)

Blazing goIITian

Olaaa!! Perrrfect answer. 236  [398 rates]
joyfrancis's Avatar
total posts: 1801    
offline Offline

Just by observation it is clear that A=pi/2 and B=-pi/6 would satisfy both conditions.


Hence 3A + B = 3pi/2 - pi/6 = 4pi/3 


 
There is no better feeling in this world than being a winner!
 this reply: 0 points  (with 0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]
 
You have to be logged on to rate
  
[Post New]14 May 2008 15:53:45 IST
    Subject: Re:find the value
[Up] View Post
allamraju (3410)

Blazing goIITian

Olaaa!! Perrrfect answer. 604  [799 rates]
allamraju's Avatar
total posts: 1014    
offline Offline
sinA+sinB=2sin(A+B/2)cos(A-B/2) and cosA+cosB=2cos(A+B/2)cos(A-B/2)

dividing 1 by 2,we have,tan(A+B/2)=1/rt3A+B=pi/3.

Substituting in 1,sinA+sin(pi/3-A)=1/22sin(pi/6)cos(A-pi/6)=1/2A=pi/6+pi/3=pi/2B=-pi/6.

Hence,3A+B=4pi/3
MAKING A MISTAKE IS HUMAN BUT REPEATING IT IS IDIOTIC.
 this reply: 4 points  (with 0 Olaaa!! Perrrfect answer.   in 2 votes )   [?]
 
You have to be logged on to rate
  
 
Forum Index -> Trignometry
Go to:   

Top Offers for goIITians
Correspondence Courses
Brilliant Tutorials
Narayana Institute
Aakash Institute
Classroom/Crash Courses
Narayana - Kota , Delhi , Others
Brilliant Tutorials - Class , Crash
Aakash Institute - Medical , Engg
Online Test Series
Brilliant Tutorials
Narayana Institute
Aakash Institute
Mahesh Tutorials
AMITY      Sri Chaitanya