For each of the integrals below, decide (without calculation) whether the integrals are positive, negative, or zero. Let D be the region inside the unit circle centered on the origin, R be the right half of D, T be the top half of D. (a) SR(5y + ) dA is positive (b) Sn 5æ dA is positive v (c) Sr(5x? + a*) dA is positive v (d) Sr 5ydA is positive v

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