Find all the pairs of x,y that satisfy t...

Find all the pairs of x,y that satisfy the equation`cos x + cos y+ cos(x+y)=-(3)/(2)`

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The correct Answer is:

(i) `x=2mpipm(2pi)/(3),y=2(m-n)pipm 2p[i)/(3),m,n in I`
(ii)`2npi-(pi)/(4)`

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