"S: ( y=x, y = 2x, x = 2 )"
"\\iint x^4+y^2 dS = \\\\\nS \\\\\n\n\\int_0^2 \\int_x^{2x} x^4 + y^2 dydx ="
"\\int_0^2 \\big[ x^4y + \\cfrac13 y^3 \\big]_x^{2x} dx ="
"\\int_0^2 x^4(2x-x)+\\cfrac13(8x^3-x^3) dx ="
"\\int_0^2 x^5+\\cfrac73x^3 dx = \\big[ \\cfrac16x^6 + \\cfrac7{12}x^4 \\big]_0^2 ="
"\\cfrac16(2^6 - 0^6) + \\cfrac7{12}(2^4 - 0^4) = \\cfrac{2^2(2^3 + 7)}3 = 20"
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