The Total solution for NCERT class 6-12
Verifythat (adj A) A = |A| I = A (adj A) for the above matrices.
(i) Let
A =
Cofactors of A are
C11 = 4
C12 = – 2
C21 = – 5
C22 = – 3
(ii) Let
Therefore cofactors of A are
C11 = d
C12 = – c
C21 = – b
C22 = a
(iii) Let
C11 = cos α
C12 = – sin α
C21 = – sin α
C22 = cos α
(iv) Let
C11 = 1
C12 = tan α/2
C21 = – tan α/2
C22 = 1