Q. 273.8( 6 Votes )

If show that

Answer :

Given :


To show :


Formula used :



Where cij = ai1b1j + ai2b2j + ai3b3j + ……………… + ainbnj


If A is a matrix of order a b and B is a matrix of order c d ,then matrix AB exists and is of order a d ,if and only if b = c


A =


A2 = ×


A2 =


A2 =


We know that cos2α = and sin2α =


A2 =


A2 =


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