(Algebra: add two matrices) Write a method to add two matrices. The header of the method is as follows:
public static double [][] addMatrix(double[] [] a , double[][] b)
In order to be added, the two matrices must have the same dimensions and the same or compatible types of elements. Let c be the resulting matrix. Each element cij is aij + bij. For example, for two 3 × 3 matrices a and b, c is
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