1. Integrate the following: a. [ [ (4-y') dydx b. 1 1 ( y -2 xy) dydx 0 0 0 -2 X 7 sin x C. x sin y dydx d. [y dydx 0 0 0 0 2. Sketch the region of integration and evaluate | | ydxdy, where R is the interior of the R triangular region bounded by the lines y = x, y = 2x, x + y =2