Let the vectors 'veca, vecb, vecc' be given as 'a_1 hati+a_2 hatj+a_3 hatk, b_1 hati+b_2 hatj+b_3 hatk, c_1 hati+c_2 hatj+c_3 hatk', Then
show that 'veca xx(vecb+vecc)=veca xx vecb+veca xx vecc'
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