Question

15. If ABC is right angled at C, then the value of cos (A + B) is​

Answer 1

Answer:

0

Step-by-step explanation:

Fiven, C= 90°

A+B+C = 180°(Angle sum property)

=> A+B = 180° -C = 180° - 90° = 90°

Therefore,

cos(A+B)

= cos90° = 0