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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