Question

if triangleABC is right angled at C, then the value of Cos (A + B) is​

Answer 1

Answer:

0

Step-by-step explanation:

We know that the sum of all 3 angles in a triangle is 180° .

C=90°

But,

A+B+C=180°

⟹A+B=(180−90)°=90°

We also know that cos90°=0

Hence,

cos(A+B)=0