If cosx.cosy + sinx.siny = -1 then cosx + cosy is
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according to the question
cos(x-y) =-1
x-y=π
let x=π
y=0
cosπ+cos0=0
cos(x-y) =-1
x-y=π
let x=π
y=0
cosπ+cos0=0
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0
Answer:
1
Step-by-step explanation:
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