A contour diagram of is given in the figure.
Determine whether and are
positive, negative, or zero at the points P, Q, R, and S.
1. at the point S.
2. at the point R.
3. at the point S.
4. at the point P.
5. at the point Q.
6. at the point Q.
7. at the point P.
8. at the point S.
9. at the point R.
10. at the point R.
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