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For what value of a, the vector field 28 (@xy-jju+ (2-2) x + (-a) xzk such that irrotational ? Also find the scelar function

For what value of a, the vector field 28 (@xy-jju+ (2-2) x + (-a) xzk such that irrotational ? Also find the scelar function & 7-30, where F is irrational.

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