Question

if triangle ABC is right angied at C, then the value of cos (A+B) is:
1​

Answer 1

Answer:

0

Step-by-step explanation:

As C = 90°

A + B + C = 180°

=> A + B + 90° = 180°

=> A + B = 90°

Cos(A+B) = Cos90° = 0