Question

If
sinA + sinB=2
then what is the value of
Cos(A+B)​

Answer 1

Answer:

cos(A+B)= -1

Step-by-step explanation:

maximum value of sinx is 1

here it is clear that if sum of 2 sin is 2 then each of them must be equal to 1

therefore sinA = 1 and sinB= 1

or A =B = 90°

cos(A+B) = Cos(90 +90)

cos180° = -1

IT IS QUESTION OF BOUNDED FUNCTION because sin is bounded to be equal to 1