The question is attached above. Please send step by step complete solution. I also request you please do not send any web link to this question because I am unable to  open the link every time  .

Asked by sudhanshubhushanroy | 14th Dec, 2017, 06:51: AM

Expert Answer:

begin mathsize 16px style Using space trigonometric space formulae comma
straight A plus straight B plus straight C equals straight pi
Also space sin space rule space sinA over straight a equals sinB over straight b equals sinC over straight c equals straight k
and space cosine space rule space cosA equals fraction numerator straight b squared plus straight c squared minus straight a squared over denominator 2 bc end fraction comma space cosB equals fraction numerator straight c squared plus straight a squared minus straight b squared over denominator 2 ca end fraction comma space cosC equals fraction numerator straight a squared plus straight b squared minus straight c squared over denominator 2 ab end fraction
simplify space it space to space get space the space answer. end style

Answered by Sneha shidid | 15th Dec, 2017, 02:17: PM