Give examples to show that : `AB=BA`

Give examples to show that : AB is a null matrix, where neither A nor B is a null matrix.

Give examples to show that : A^2=I , where A ne I

Give examples to show that : A^2 is a null matrix though A is not null matrix.

Give three examples to show that friction is increased deliberately

Give an example to show that the product of two non-zero matrices is a zero matrix.

Give an example to show that the function gof is defined and onto though the functions both f and g are not necessarily onto.

Give an example to show that the function gof is defined and one-one though the functions both f and g are not necessarily one-one.

Give an example to show that suntraction is not a binary operation on the set of natural numbers.