Question

if 1+cos (x-y)=0 then a)cos x - cos y = 0
b)cos x + cos y = 0
c)cos x + sin y = 1
d)sin x + cos y = 1 ​

Answer 1

Answer:

b ) cos x +cos y

Step-by-step explanation:

1+cos(x-y)=0

1+cos x -1+cos y=0

0+cos x + cos y = 0

cos x +cos y=0