" 11."[[2,-6],[1,-2]]

If A = [[2,-1,1],[-1,2,-1],[1,-1,2]] , Verify that A^3-6A^2+9A-4I=O and hence find A^-1 .

If A=[[2,0,-1],[5,1,0],[0,1,3]] , prove that : A^-1=A^2-6A+11I

Write true or false in the following case: [[3,1],[6,2]]=3[[1,1],[2,2]]

Evaluate the following : {[[1,3],[-1,-4]]+[[3,-2],[-1,1]]}[[1,3,5],[2,4,6]]

If A=[[1,2,5],[3,4,6]] and B=[[4,0],[2,1],[1,1]] then find AB

If A= [[1,1],[-1,1]] , then A^(2) equals

Calculate the cosine of the angle A of the triangle with vertices A(1,-1,2), B(6,11,2),C(1,2,6).

The vertices of a triangle are A(1,-1,2),B(6,11,2),C(1,2,6) then cos A

The vertices of a triangle are A(1,-1,2) ,B(6,11,2),C(1,2,6) then cos A= (A) (63)/(65) (B) (36)/(65) (C) (16)/(65) (D) (13)/(65)

The cosine of the angle of the triangle with vertices A(1,-1,2),B(6,11,2) and C(1,2,6) is