ZOGA27JUNE Active member
 Subject: TRIGNOMETRY Sun Jan 13, 2008 2:40 pm  
 hey guys ! i was preparing 4 my maths exam (its 2mrw) n i came acros ths q.its realy an interesting q n i lykd it,so i thot i'l put ths q up 4 u guys.its a very typical q. In triangle ABC,prove that: tan (B+C/2)=cotA/2 LETS C WHO SOLVES IT 1ST.............. !!!!!!!!!!!!!!!! i'l post d solution 2mrw......so....y ya staring at it..???win....bt m realy sory i cnt gv u ne prize 'cept these ' ',bt course u'l get d satisfaction of solvng it 1st n plz corectly !!!!!! ZOGA27JUNE 

ZOGA27JUNE Active member
 Subject: Re: TRIGNOMETRY Mon Jan 14, 2008 9:21 pm  
 hey this z 4 ppl who r interested . SOLUTION TO THE PROBLEM POSTED ABOVE. in a triangle the sum of all angles is 180,hence it can be written : LA + LB + LC = 180 (L  angle) A+B+C/2 = 180/2 (ITS WHOLE ON 2) A+B+C/2 = 90 A/2 + B/2 + C/2 = 90 B+C/2 = 90  A/2 tan ( B+C/2) = cot A/2 LHS : tan (B+C/2) = tan (90 A/2) = cot A/2 since tan (90  A) = cot A x  x  x  x  x 

amydecia Active member
 Subject: Re: TRIGNOMETRY Fri May 20, 2011 1:04 pm  
 Trigonometry is really amazing if you got deep in it. If you not understand its basic then in the end to will not meet the answer. these are not that difficult equation.


vikram04 Active member
 
sanjay.sharma
 Subject: Re: TRIGNOMETRY Sun Sep 16, 2012 10:27 am  
 please send me a list of books for preparation of iit jee complete list and their solution also 

amydecia Active member
 Subject: Re: TRIGNOMETRY Thu Jan 31, 2013 2:23 pm  
  ZOGA27JUNE wrote:
 hey this z 4 ppl who r interested .
SOLUTION TO THE PROBLEM POSTED ABOVE. in a triangle the sum of all angles is 180,hence it can be written : LA + LB + LC = 180 (L  angle) A+B+C/2 = 180/2 (ITS WHOLE ON 2) A+B+C/2 = 90 A/2 + B/2 + C/2 = 90 B+C/2 = 90  A/2 tan ( B+C/2) = cot A/2 LHS : tan (B+C/2) = tan (90 A/2) = cot A/2 since tan (90  A) = cot A x  x  x  x  x
It's amazing...Mathematics is one of mine favorite subject in school life & college life..I always got good marks in mathematics & Trigonometry is too interesting topic in mathematics if we are learning to depth..... 
