just number 3.49 when i was doing the second part of the divergence theorem i got 12pi plus 192pi no

just number 3.49
when i was doing the second part of the divergence theorem i got 12pi plus 192pi now i get that the 12 needs to be negative so that both sides equal 180 but i don understand whwre the negative comes from. when your solving the problem please explain thank you. s (b) |-D do 3.49 For the vector field D = R3R2, evaluate both sides of the divergence theorem for the region enclosed between the spherical shells defined by R = 1 and R=2. 3.50 For the vector field E = ixy – ġ (x2 + 2y2), calculate (a) Edl around the triangular contour shown in Fig. P3.50(a).

 

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