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(Solved): (2) Use the transformation \\( u=x y, v=x y^{4} \\) to find \\[ \\iint_{R} \\sin (x y) d A \\] wher ...
(2) Use the transformation \\( u=x y, v=x y^{4} \\) to find \\[ \\iint_{R} \\sin (x y) d A \\] where \\( R \\) is the region enclosed by the curves \\( x y=\\pi, x y=2 \\pi, x y^{4}=1, x y^{4}=2 \\).