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(Solved): Use the given transformation to evaluate the integral.
9 cos
9
y x
y + x
dA
R
where R ...
Use the given transformation to evaluate the integral.
9 cos
9
y − x
y + x
dA
R
where R is the trapezoidal region with vertices (6, 0), (9, 0), (0, 9), and (0, 6);
u = y − x, v = y + x