1.

The set of solutions of the systemof equationsx+y=(2pi)/3 and cosx + cosy = 3/2 where x,y are real , is

Answer»

`{(x,y): COS ((x-y)/2)=1/2}`
`{(x,y): SIN ((x-y)/2)=1/2}`
`{(x,y): cos (x-y)=1/2}`
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