Question

cosA+cosB=2, sin(A+B) =? ​

Answer 1

Answer:

What is the question dear,,

I can't understand......

Answer 2

Answer:

0

Step-by-step explanation:

if, cosA+cosB=2

then, cosA = cosB = 1

=> A =B = 0 [ cos0 = 1 ]

so, sin(A+B)= sin (0+0)= 0 [ sin 0 = 0]