tamer mansour
02-09-2009, 06:11 PM
ABC is a triangle in which a = b . Prove that : SinC = 2 SinA CosB
|
مشاهدة النسخة كاملة : Trigonometry tamer mansour 02-09-2009, 06:11 PM ABC is a triangle in which a = b . Prove that : SinC = 2 SinA CosB وليد خليف 03-09-2009, 10:19 PM ABC is a triangle in which a = b . Prove that : SinC = 2 SinA CosB since a =b then A = B=Y(say) then C= 180-2Y i.e. sin C= sin (180-2y) =sin2Y=2sinYcosY=2sinAcosB:av4056bb7jp3: tamer mansour 04-09-2009, 01:55 AM Excellent its a nice solution But Can you prove the problem by Sine and Cosine law tamer mansour 04-09-2009, 01:57 AM سوف يتم في هذا الموضوع أن شاء الله وضع مسائل لطلبة اللغات |