Invert a $2\times 2$ Matrix containing trig functions
7795
Find the inverse of a Trig Matrix
143689
Real $2\times 2$ matrix $X$ such that $X^2 + 2X= -5I$
6398
Can the product of an $4\times 3$ matrix and a $3\times 4$ matrix be invertible?
4517
Showing a $2\times2$ matrix is invertible
8970
Proving the cross product matrix tranformation identity with an alternative solution
18585
Showing $A-I$ is invertible, when $A$ is a skew-symmetric matrix
109217
Invertibility of the Product of Two Matrices
153506
Proving the inverse of a matrix equals $I_n-\frac{1}{n-1}A$
58491
Proving the inverse of a matrix as a polynomial of matrices
108589
The inverse of the matrix $\{1/(i+j-1)\}$
46623
How to evaluate the derivatives of matrix inverse?
125021
Inverse of an invertible upper triangular matrix of order 3
17584
Integer matrices with integer inverses
145768
The inverse of a matrix in which the sum of each row is $1$
20856
Inverse of Linear Transformations
84400
Build a Companion Matrix of a Polynomial?
46567
Derivatives of inverse matrix