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[" 7.If "sum(i=1)^(n)cos theta(1)=n," th...

[" 7.If "sum_(i=1)^(n)cos theta_(1)=n," then "sum_(i=1)^(n)sin theta_(1)" equals,if "theta in[0,2 pi)],[" (1) "0],[" (2) "1],[" (3) "-1],[" (4) "2]

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