∬_D▒〖x cosy dA,〗 D is bounded by y=0 and y=x^2 and x=1
∬_D▒〖(x+y)dA,〗 D is bounded by y=√x and y=x^2
∬_D▒〖y^3 dA,〗 D is the triangular region with
vertices (0,2),(1,1) and (3,2)
∬_D▒〖xy^2 dA,〗 D is bounded by x=0 and x=√(1-y^2 )
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