The question is attached. Please send the step by step complete solution. I also request that please don't send any weblink to this question because I am unable to open thelink everytime.

Asked by sudhanshubhushanroy | 12th Dec, 2017, 08:22: PM

Expert Answer:

begin mathsize 16px style 2 straight a squared plus 4 straight b squared plus straight c squared equals 4 ab plus 2 ac
2 straight a squared minus 4 ab plus 4 straight b squared plus straight c squared minus 2 ac equals 0
straight a squared minus 4 ab plus 4 straight b squared plus straight a squared plus straight c squared minus 2 ac equals 0
left parenthesis straight a minus 2 straight b right parenthesis squared plus left parenthesis straight a minus straight c right parenthesis squared equals 0
rightwards double arrow straight a equals 2 straight b space or space straight a equals straight c
straight a equals 2 straight b equals straight c
rightwards double arrow straight a over 1 equals fraction numerator straight b over denominator begin display style 1 half end style end fraction equals straight c over 1
Find space cosB space using space cosine space rule space you space will space get space 7 over 8. end style

Answered by Sneha shidid | 13th Dec, 2017, 10:52: AM