3. Consider a function of two variables f(x, y) (it does not really matter what the...

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3. Consider a function of two variables f(x, y) (it does not really matter what the actual function is) and the double integral f(x,y) dy dr. If we change the order of integration of this double integral, then we obtain [f(x,y) dx dy. What should a, b, c and d be? (2 points) 4. Compute the double integral cos(r) drdy. Show your work. (3 points) Hint: I would not waist energy trying to find cos(r)dr if I were you.... 3. Consider a function of two variables f(x, y) (it does not really matter what the actual function is) and the double integral f(x,y) dy dr. If we change the order of integration of this double integral, then we obtain [f(x,y) dx dy. What should a, b, c and d be? (2 points) 4. Compute the double integral cos(r) drdy. Show your work. (3 points) Hint: I would not waist energy trying to find cos(r)dr if I were you....