Instructions: For each region described, set up, BUT DO NOT EVALUATE, a single definite integral that represents the exact area of the region. You must give explicit functions as your integrands, and specify limits in each case. You do not need to evaluate the resulting integral.
1. The region enclosed by the lines y=x, y=2x and y=4.
2. The region enclosed by the curve y=x^2 and the line y=5x+6.
3. The portion of the region inside the circle x^2+y^2 =4 ,above the line y=0 but below the line y=x.
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