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The solution(s) of the equation sin7x+...

The solution(s) of the equation `sin7x+cos2x=-2` is/are (a)`x=(2kpi)/7+(3pi)/(14),\ k in I` (b) `x=npi+pi/4\ k in I` `x=2npi+pi/2,\ k in I` (d) none of these

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