Question

If cos x + cos y = 2, then the value of sin x + sin y is:
(A) 0
(C) 2
(B) 1
(D) - 1​

Answer 1

Answer:

:cos x + cos y = 2 is possible Only whencos x = cos y = 1 (Max value of cos function is 1 so 1+1=2)Since cos x = 1, so