I need to write an m-file using matlab for this problem Problem # 3 (25 points): Evaluate following double integral: 1-112(x2-2y2 + xy?) dx dy using multiple-application trapezoidal rule, with n-20 in both x and y directions. Also, compute the percent relative error. As you can see in Section 21.5 of textbook, the numerical integration technique covered in class can be readily employed for multiple integrals (You solved similar problem for single-integral in class and your HWs: your code can be readily extended for this double integral).

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