20. Which of the following is the equivalent integral for [(x+y)sin(z(x-y)) dxdy where R is bounded by x+y = 0, x+y=2, x-y=-1,x-y=3 using the change of variables x + y= u and x - y = v? L[u sin(zv) dudv b. Ltusin(zv) dudv а. L vsin(zu) dudv с. d. L[-)usin(zv) dudv [usin(zv) dudv е. f. None of these

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