Tip 20

Did You Know...
You easily calculate the determinant of a square matrix.

For example:
Put the matrix [ [1 2] ] [3 4] ]on the stack.
Type DET and press [ENTER]
Result: - 2

More...
Using 1/X you can also invert square matrixes.
This works for square matrices of all order.
It is limited only by memory.