Question: 9. Evaluate the following double integrals. (a) (3 marks) (b) (6 marks) R SS R r cos y dA where R is the rectangle

9. Evaluate the following double integrals. (a) (3 marks) (b) (6 marks) R SS R r cos y dA where R is the rectangle with 0 x 3 and 0 y x + 4y dA where R is the region enclosed by y = x and y = x.

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