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
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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
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