Question: Use arrows to sketch each of the following vector fields: (a) E1 = xx - yy, (b) E2 = - Ф (c) E3 = y

Use arrows to sketch each of the following vector fields:
(a) E1 = xx - yy,
(b) E2 = - Ф
(c) E3 = y 1/x
(d) E4 = r cos.

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