Arts (English Medium) Class 12 - CBSE Question Bank Solutions for Mathematics

If A = `[(-1, 2, 3),(5, 7, 9),(-2, 1, 1)]` and B = `[(-4, 1, -5),(1, 2, 0),(1, 3, 1)]`, then verify that (A + B)' = A' + B'

If A = `[(-1, 2, 3),(5, 7, 9),(-2, 1, 1)]` and B = `[(-4, 1, -5),(1, 2, 0),(1, 3, 1)]`, then verify that (A – B)' = A' – B'

If  A' = `[(3, 4),(-1, 2),(0, 1)]` and B = `[(-1, 2, 1),(1, 2, 3)]`, then verify that (A + B)' = A' + B'

If A' = `[(3, 4),(-1, 2),(0, 1)]` and B = `[(-1, 2, 1),(1, 2, 3)]`, then verify that (A – B)' = A' – B'

If A' = `[(-2, 3),(1, 2)]` and B = `[(-1, 0),(1, 2)]`, then find (A + 2B)'

For the matrices A and B, verify that (AB)′ = B'A', where A = `[(1),(-4),(3)]`, B = `[(-1, 2, 1)]`

For the matrices A and B, verify that (AB)′ = B'A' where A = `[(0),(1),(2)]`, B = `[(1, 5, 7)]`

If A = `[(cos α, sin α), (-sin α, cos α)]`, then verify that  A' A = I

If A = `[(sin α, cos α), (-cos α, sin α)]`, then verify that A'A = I

Show that the matrix A = `[(1, -1, 5),(-1, 2, 1),(5, 1, 3)]` is a symmetric matrix.

Show that the matrix  A = `[(0, 1, -1),(-1, 0, 1),(1, -1, 0)]` is a skew symmetric matrix.

For the matrix A = `[(1, 5),(6, 7)]` verify that (A + A') is a symmetric matrix.

For the matrix A = `[(1, 5),(6, 7)]`, verify that (A – A') is a skew symmetric matrix.

Find `1/2` (A + A') and `1/2` (A – A'), when A = `[(0, a, b),(-a, 0, c),(-b, -c, 0)]`

Express the following matrices as the sum of a symmetric and a skew symmetric matrix:

`[(3, 5),(1, -1)]`

Express the following matrices as the sum of a symmetric and a skew symmetric matrix:

`[(6, -2, 2),(-2, 3, -1),(2, -1, 3)]`

Express the following matrices as the sum of a symmetric and a skew symmetric matrix:

`[(3, 3, -1),(-2, -2, 1),(-4, -5, 2)]`

Express the following matrices as the sum of a symmetric and a skew symmetric matrix:

`[(1, 5),(-1, 2)]`

If A and B are symmetric matrices, prove that AB – BA is a skew symmetric matrix.

Show that the matrix B'AB is symmetric or skew symmetric according as A is symmetric or skew symmetric.