If triangle abc is right angled at c, then the value of Cos (A + B) a)

1.	If triangle abc is right angled at c, then the value of Cos (A + B) a)0 b)1 c)1/2 d)√3/2
Answer» Ro But thank you so much...??? Pta nhi aadu ye app he bekar aur bhut slow bhi... ???????????? Hii adya Kya hua mujhse kya galti ho gayi royal bro Niche wala to solution to mera gya nhi tha...error occurred ho gya tha ??phir kaise show kar rha h...??? ?? Hiii bro A + B + C = 180 => A + B + 90 = 180 => A + B = 90° Now, Cos (A+B) => Cos 90 => 0 Angle (A + B + C) = 180° => Angle (A + B + 90°) = 180° => Angle (A + B) = 90° Now, Cos (A + B) => Cos 90° => 0 Because c=90 Sum of triangale angle is 180 A+b+c =180 A+b+90 =180 A+b =90 Cos (a+b)=cos90 O 0 a) 0 Please give full solution.... How ❓ 0

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