For a two-dimensional irrotational flow, the velocity potential is defined as φ = In(x2+y2). Which of the following is a possible stream function, ψ, for this flow? (a) 1/2tan-1 (y/x) (b) tan-1 (y/x) (c) 2 tan-1 (y/x) (d) 2 tan-1 (x/y)
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