Question

(a) 8. If AABC is right angled at C, then the value of cos (A + B) is (a) 0 (b) 1/2 (c) √3/2 (d) 1​

Answer 1

Answer:

Step-by-step explanation:

if angle c is right angle so angle a+angle b= 180-90 =90 degrees

so cos(a+b)=cos90 =0

so answer is option a